IDE 2.0 rc3 is very slow to open

[FarhanKhosravi]

Describe the bug
the app takes few minutes too open and show application environment; and splash screen is very annoying (stays on top while app is opening)

To Reproduce
Double clicking on app icon.
to optain a log: opening by cmd

Expected behavior
load in just few secounds

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: windows
• Version: 11 (latest)

Additional context

the log text on cmd:

Starting backend process. PID: 6892
Using browser-only version of superagent in non-browser environment
Configuring to accept webviews on '^.+\.webview\..+$' hostname.
root INFO Configuration directory URI: 'file:///c%3A/Users/Farhan/.theia'
root ERROR (node:6892) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
root INFO Theia app listening on http://localhost:3229.
root WARN The local plugin referenced by local-dir:/c%3A/Users/Farhan/.arduinoIDE/plugins does not exist.
root WARN The local plugin referenced by local-dir:/c%3A/Users/Farhan/.arduinoIDE/extensions does not exist.
root WARN The local plugin referenced by local-dir:C:\Users\Farhan\.arduinoProIDE\plugins does not exist.
root INFO PluginTheiaDirectoryHandler: accepting plugin with path
root INFO Resolved "cortex-debug" to a VS Code extension "cortex-debug@0.3.10" with engines:
root INFO PluginTheiaDirectoryHandler: accepting plugin with path
root INFO Resolved "vscode-arduino-tools" to a VS Code extension "vscode-arduino-tools@0.0.2-beta.1" with engines:
root INFO PluginTheiaDirectoryHandler: accepting plugin with path
root INFO Resolved "vscode-builtin-cpp" to a VS Code extension "cpp@1.52.1" with engines:
root INFO PluginTheiaDirectoryHandler: accepting plugin with path
root INFO Resolved "vscode-builtin-json" to a VS Code extension "json@1.46.1" with engines:
root INFO PluginTheiaDirectoryHandler: accepting plugin with path
root INFO Resolved "vscode-builtin-json-language-features" to a VS Code extension "json-language-features@1.46.1" with engines:
root INFO Deploying backend plugin "cortex-debug@0.3.10" from "D:\Program Files\Arduino IDE\resources\app\plugins\cortex-debug\extension\dist\extension"
root INFO Deploying backend plugin "vscode-arduino-tools@0.0.2-beta.1" from "D:\Program Files\Arduino IDE\resources\app\plugins\vscode-arduino-tools\extension\dist\bundle"
root INFO Deploying backend plugin "cpp@1.52.1" from "D:\Program Files\Arduino IDE\resources\app\plugins\vscode-builtin-cpp\extension"
root INFO Deploying backend plugin "json@1.46.1" from "D:\Program Files\Arduino IDE\resources\app\plugins\vscode-builtin-json\extension"
root INFO Deploying backend plugin "json-language-features@1.46.1" from "D:\Program Files\Arduino IDE\resources\app\plugins\vscode-builtin-json-language-features\extension\client\dist\jsonMain"
root INFO Deploy plugins list took: 856.1 ms
root WARN Backend ConfigServiceImpl.onStart is slow, took: 2773.2 ms
daemon INFO Starting daemon from D:\Program Files\Arduino IDE\resources\app\node_modules\arduino-ide-extension\build\arduino-cli.exe...
daemon INFO Using config file: c:\Users\Farhan\.arduinoIDE\arduino-cli.yaml
daemon INFO arduino-cli.exe version 0.20.2
daemon INFO Executing `arduino-cli daemon`
daemon INFO Setting up Prometheus metrics on :9090/metrics
daemon INFO {"IP":"127.0.0.1","Port":"3230"}
daemon INFO Daemon is running.
root INFO Git askpass helper is listening on http://127.0.0.1:3241.
daemon INFO Adding libraries dir [dir: c:\Users\Farhan\Documents\Arduino\libraries, location: user]
daemon INFO URL: https://downloads.arduino.cc/packages/package_index.json
daemon INFO Updating index [url: https://downloads.arduino.cc/packages/package_index.json]
root ERROR Error: Git installation not found.
    at D:\Program Files\Arduino IDE\resources\app\node_modules\find-git-exec\lib\find-git-exec.js:69:69
    at async DefaultGitInit.init (D:\Program Files\Arduino IDE\resources\app\node_modules\arduino-ide-extension\lib\node\theia\git\git-init.js:22:49)
root WARN Frontend CommonFrontendContribution.configure is slow, took: 434.0 ms
root WARN Failed to resolve module: @types/body-parser
root WARN Failed to resolve module: @types/cookie
root WARN Failed to resolve module: @types/dompurify
root WARN Failed to resolve module: @types/express
root WARN Failed to resolve module: @types/fs-extra
root WARN Failed to resolve module: @types/lodash.debounce
root WARN Failed to resolve module: @types/lodash.throttle
root WARN Failed to resolve module: @types/react
root WARN Failed to resolve module: @types/react-dom
root WARN Failed to resolve module: @types/react-virtualized
root WARN Failed to resolve module: @types/route-parser
root WARN Failed to resolve module: @types/safer-buffer
root WARN Failed to resolve module: @types/ws
root WARN Failed to resolve module: @types/yargs
root WARN Failed to resolve module: @theia/monaco
root WARN Failed to resolve module: @theia/editor
root WARN Failed to resolve module: @types/multer
root WARN Failed to resolve module: @types/rimraf
root WARN Failed to resolve module: @types/tar-fs
root WARN Failed to resolve module: @types/uuid
root WARN Failed to resolve module: @theia/navigator
root WARN Failed to resolve module: @types/p-queue
root WARN Failed to resolve module: @theia/preferences
root WARN Failed to resolve module: @theia/editor-preview
root WARN Failed to resolve module: @theia/keymaps
root WARN Failed to resolve module: @theia/messages
root WARN Failed to resolve module: @types/diff
root WARN Failed to resolve module: @types/markdown-it
root WARN Failed to resolve module: @types/mime
root WARN Failed to resolve module: @types/request
root WARN Failed to resolve module: @types/atob
root WARN Failed to resolve module: @types/auth0-js
root WARN Failed to resolve module: @types/btoa
root WARN Failed to resolve module: @types/dateformat
root WARN Failed to resolve module: @types/deepmerge
root WARN Failed to resolve module: @types/glob
root WARN Failed to resolve module: @types/google-protobuf
root WARN Failed to resolve module: @types/js-yaml
root WARN Failed to resolve module: @types/keytar
root WARN Failed to resolve module: @types/ncp
root WARN Failed to resolve module: @types/node-fetch
root WARN Failed to resolve module: @types/ps-tree
root WARN Failed to resolve module: @types/react-select
root WARN Failed to resolve module: @types/react-tabs
root WARN Failed to resolve module: @types/temp
root WARN Failed to resolve module: @types/which
root WARN Frontend keybindings.onStart is slow, took: 158.9 ms
root ERROR DefaultJsonSchemaContribution.registerSchemas is taking more than 500.0 ms, new schemas are ignored.
root ERROR Error while updating index in attempt 0.
daemon INFO URL: https://downloads.arduino.cc/packages/package_index.json
daemon INFO Updating index [url: https://downloads.arduino.cc/packages/package_index.json]
root INFO Updating index: package_index.json completed.
root INFO Updating index: package_index.json.sig completed.
daemon INFO Checking signature [error: opening signature file: open C:\Users\Farhan\AppData\Local\Temp\615091374.sig: The system cannot find the file specified., index: C:\Users\Farhan\AppData\Local\Temp\615091374, signaturefile: C:\Users\Farhan\AppData\Local\Temp\615091374.sig]
daemon INFO URL: http://dan.drown.org/stm32duino/package_STM32duino_index.json
daemon INFO Updating index [url: http://dan.drown.org/stm32duino/package_STM32duino_index.json]
root INFO Updating index: package_STM32duino_index.json completed.
daemon INFO Checking signature [error: opening signature file: open C:\Users\Farhan\AppData\Local\Temp\520892944.sig: The system cannot find the file specified., index: C:\Users\Farhan\AppData\Local\Temp\520892944, signaturefile: C:\Users\Farhan\AppData\Local\Temp\520892944.sig]
daemon INFO Updating libraries index
root INFO Updating index: library_index.json.gz completed.
root INFO Updating index: library_index.json.sig completed.
daemon INFO Checking signature [index: c:\Users\Farhan\AppData\Local\Arduino15\package_index.json, signaturefile: c:\Users\Farhan\AppData\Local\Arduino15\package_index.json.sig, trusted: true]
daemon INFO Checking signature [error: opening signature file: open c:\Users\Farhan\AppData\Local\Arduino15\package_STM32duino_index.json.sig: The system cannot find the file specified., index: c:\Users\Farhan\AppData\Local\Arduino15\package_STM32duino_index.json, signaturefile: c:\Users\Farhan\AppData\Local\Arduino15\package_STM32duino_index.json.sig]
daemon INFO Loading hardware from: c:\Users\Farhan\AppData\Local\Arduino15\packages
daemon INFO Loading package MiniCore from: C:\Users\Farhan\AppData\Local\Arduino15\packages\MiniCore\hardware
daemon INFO Adding monitor tool [protocol: serial, tool: builtin:serial-monitor]
daemon INFO Loaded platform [platform: {ID:"MiniCore:avr",Installed:"2.1.3",Latest:"2.1.3",Name:"MiniCore"}]
daemon INFO Loading package arduino from: C:\Users\Farhan\AppData\Local\Arduino15\packages\arduino\hardware
daemon INFO Checking signature [error: opening signature file: open C:\Users\Farhan\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.4\installed.json.sig: The system cannot find the file specified., index: C:\Users\Farhan\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.4\installed.json, signaturefile: C:\Users\Farhan\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.4\installed.json.sig]
daemon INFO Adding monitor tool [protocol: serial, tool: builtin:serial-monitor]
daemon INFO Loaded platform [platform: {ID:"arduino:avr",Installed:"1.8.4",Latest:"1.8.4",Name:"Arduino AVR Boards"}]
daemon INFO Checking existence of 'tools' path: C:\Users\Farhan\AppData\Local\Arduino15\packages\arduino\tools
daemon INFO Loading tools from dir: C:\Users\Farhan\AppData\Local\Arduino15\packages\arduino\tools
daemon INFO Loaded tool [tool: Version: 1.3.0 Systems: [OS: i686-linux-gnu, OS: x86_64-linux-gnu, OS: arm-linux-gnueabihf, OS: aarch64-linux-gnu, OS: i386-apple-darwin11, OS: i686-mingw32]]
daemon INFO Loaded tool [tool: Version: 7.3.0-atmel3.6.1-arduino7 Systems: [OS: arm-linux-gnueabihf, OS: aarch64-linux-gnu, OS: x86_64-apple-darwin14, OS: i686-mingw32, OS: i686-linux-gnu, OS: x86_64-linux-gnu]]
daemon INFO Loaded tool [tool: Version: 6.3.0-arduino17 Systems: [OS: arm-linux-gnueabihf, OS: aarch64-linux-gnu, OS: x86_64-apple-darwin12, OS: x86_64-linux-gnu, OS: i686-linux-gnu, OS: i686-mingw32]]
daemon INFO Loaded tool [tool: Version: 6.3.0-arduino18 Systems: [OS: arm-linux-gnueabihf, OS: aarch64-linux-gnu, OS: x86_64-apple-darwin12, OS: x86_64-linux-gnu, OS: i686-mingw32]]
daemon INFO Loading package builtin from: C:\Users\Farhan\AppData\Local\Arduino15\packages\builtin
daemon INFO Checking existence of 'tools' path: C:\Users\Farhan\AppData\Local\Arduino15\packages\builtin\tools
daemon INFO Loading tools from dir: C:\Users\Farhan\AppData\Local\Arduino15\packages\builtin\tools
daemon INFO Loaded tool [tool: Version: 5.8-arduino11 Systems: [OS: i686-pc-linux-gnu, OS: x86_64-pc-linux-gnu, OS: i686-mingw32, OS: x86_64-apple-darwin, OS: arm-linux-gnueabihf, OS: aarch64-linux-gnu]]
daemon INFO Loaded tool [tool: Version: 0.9.2]
daemon INFO Loaded tool [tool: Version: 1.0.2 Systems: [OS: i686-pc-linux-gnu, OS: x86_64-pc-linux-gnu, OS: i686-mingw32, OS: x86_64-mingw32, OS: x86_64-apple-darwin, OS: arm-linux-gnueabihf, OS: arm64-linux-gnueabihf]]
daemon INFO Loaded tool [tool: Version: 1.2.1]
daemon INFO Loaded tool [tool: Version: 1.3.0-rc1]
daemon INFO Loaded tool [tool: Version: 1.3.1 Systems: [OS: i686-pc-linux-gnu, OS: x86_64-pc-linux-gnu, OS: i686-mingw32, OS: x86_64-mingw32, OS: x86_64-apple-darwin, OS: arm-linux-gnueabihf, OS: arm64-linux-gnueabihf]]
daemon INFO Loaded tool [tool: Version: 0.9.1 Systems: [OS: i686-pc-linux-gnu, OS: x86_64-pc-linux-gnu, OS: i686-mingw32, OS: x86_64-mingw32, OS: x86_64-apple-darwin, OS: arm-linux-gnueabihf, OS: arm64-linux-gnueabihf]]
daemon INFO Adding libraries dir [dir: C:\Users\Farhan\AppData\Local\Arduino15\packages\MiniCore\hardware\avr\2.1.3\libraries, location: platform]
daemon INFO Adding libraries dir [dir: C:\Users\Farhan\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.4\libraries, location: platform]
daemon INFO starting discovery builtin:serial-discovery process
daemon INFO starting discovery builtin:mdns-discovery process
root ERROR Request repositories failed with error: Git could not be found at the expected path: 'D:\Program Files\Arduino IDE\resources\app\node_modules\dugite-no-gpl\git\cmd\git.exe'. This might be a problem with how the application is packaged, so confirm this folder hasn't been removed when packaging.
root WARN Frontend EditorNavigationContribution.onStart is slow, took: 36111.4 ms
root WARN Frontend WorkspaceService.onStart is slow, took: 273.9 ms
root INFO Board config changed:
root INFO Board config changed:
root INFO Changed application state from 'init' to 'started_contributions'.
root INFO Changed application state from 'started_contributions' to 'attached_shell'.
root INFO >>> Restoring the layout state...
daemon INFO started discovery builtin:serial-discovery process
daemon INFO sending command HELLO 1 "arduino-cli 0.20.2" to discovery builtin:serial-discovery
daemon INFO from discovery builtin:serial-discovery received message type: hello, message: OK, protocol version: 1
root INFO [71148199-1b5a-4441-bb41-28b5708558cd] Waiting for backend deployment took: 464.4 ms [Finished 43.812 s after frontend start]
root INFO [71148199-1b5a-4441-bb41-28b5708558cd] Sync of 5 plugins took: 427.5 ms [Finished 44.240 s after frontend start]
daemon INFO started discovery builtin:mdns-discovery process
daemon INFO sending command HELLO 1 "arduino-cli 0.20.2" to discovery builtin:mdns-discovery
daemon INFO from discovery builtin:mdns-discovery received message type: hello, message: OK, protocol version: 1
daemon INFO sending command START_SYNC to discovery builtin:serial-discovery
daemon INFO sending command START_SYNC to discovery builtin:mdns-discovery
daemon INFO from discovery builtin:mdns-discovery received message type: start_sync, message: OK
daemon INFO from discovery builtin:serial-discovery received message type: start_sync, message: OK
root INFO <<< The layout has been successfully restored.
root INFO Changed application state from 'attached_shell' to 'initialized_layout'.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][marus25.cortex-debug]: Loaded contributions.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][arduino.vscode-arduino-tools]: Loaded contributions.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][vscode.cpp]: Loaded contributions.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][vscode.json]: Loaded contributions.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][vscode.json-language-features]: Loaded contributions.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd] Load contributions of 5 plugins took: 153.0 ms [Finished 45.616 s after frontend start]
root WARN Frontend EditorPreviewTreeDecorator.onDidInitializeLayout is slow, took: 154.2 ms
root INFO Finished loading frontend application after 45.836 seconds
root WARN 'cpp' language is remapped from 'source.cpp.embedded.macro' to 'source.cpp' scope
root WARN a registered grammar configuration for 'cpp' language is overridden
root INFO [hosted-plugin: 10448] PLUGIN_HOST(10448) starting instance
root INFO Changed application state from 'initialized_layout' to 'ready'.
root ERROR Request repositories failed with error: Git could not be found at the expected path: 'D:\Program Files\Arduino IDE\resources\app\node_modules\dugite-no-gpl\git\cmd\git.exe'. This might be a problem with how the application is packaged, so confirm this folder hasn't been removed when packaging.
root INFO [hosted-plugin: 10448] PLUGIN_HOST(10448): PluginManagerExtImpl/init()
root INFO [hosted-plugin: 10448] PLUGIN_HOST(10448): initializing(cortex-debug@0.3.10 with D:\Program Files\Arduino IDE\resources\app\node_modules\@theia\plugin-ext-vscode\lib\node\plugin-vscode-init)
root INFO [hosted-plugin: 10448] Debugger contribution has been registered: cortex-debug
root INFO [hosted-plugin: 10448] PLUGIN_HOST(10448): initializing(vscode-arduino-tools@0.0.2-beta.1 with D:\Program Files\Arduino IDE\resources\app\node_modules\@theia\plugin-ext-vscode\lib\node\plugin-vscode-init)
PLUGIN_HOST(10448): initializing(cpp@1.52.1 with D:\Program Files\Arduino IDE\resources\app\node_modules\@theia\plugin-ext-vscode\lib\node\plugin-vscode-init)
root INFO [hosted-plugin: 10448] PLUGIN_HOST(10448): initializing(json@1.46.1 with D:\Program Files\Arduino IDE\resources\app\node_modules\@theia\plugin-ext-vscode\lib\node\plugin-vscode-init)
root INFO [hosted-plugin: 10448] PLUGIN_HOST(10448): initializing(json-language-features@1.46.1 with D:\Program Files\Arduino IDE\resources\app\node_modules\@theia\plugin-ext-vscode\lib\node\plugin-vscode-init)
root INFO [hosted-plugin: 10448] PLUGIN_HOST(10448): PluginManagerExtImpl/loadPlugin(D:\Program Files\Arduino IDE\resources\app\plugins\vscode-builtin-json-language-features\extension\client\dist\jsonMain)
root ERROR Request repositories failed with error: Git could not be found at the expected path: 'D:\Program Files\Arduino IDE\resources\app\node_modules\dugite-no-gpl\git\cmd\git.exe'. This might be a problem with how the application is packaged, so confirm this folder hasn't been removed when packaging.
root INFO [hosted-plugin: 10448] PLUGIN_HOST(10448): PluginManagerExtImpl/loadPlugin(D:\Program Files\Arduino IDE\resources\app\plugins\vscode-arduino-tools\extension\dist\bundle)
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][marus25.cortex-debug]: Started plugin.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][arduino.vscode-arduino-tools]: Started plugin.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][vscode.cpp]: Started plugin.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][vscode.json]: Started plugin.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd][vscode.json-language-features]: Started plugin.
root INFO [71148199-1b5a-4441-bb41-28b5708558cd] Start of 5 plugins took: 3285.0 ms [Finished 48.909 s after frontend start]
root INFO Starting language server: arduino:avr:nano
daemon INFO inventory.Store.ConfigFileUsed() c:\Users\Farhan\AppData\Local\Arduino15\inventory.yaml
daemon INFO inventory.Store.ConfigFileUsed() c:\Users\Farhan\AppData\Local\Arduino15\inventory.yaml
daemon INFO Searching tools required for board arduino:avr:nano
daemon INFO Required tool [tool: {ToolName:"arduinoOTA",ToolVersion:"1.3.0",ToolPackager:"arduino"}]
daemon INFO Required tool [tool: {ToolName:"avr-gcc",ToolVersion:"7.3.0-atmel3.6.1-arduino7",ToolPackager:"arduino"}]
daemon INFO Required tool [tool: {ToolName:"avrdude",ToolVersion:"6.3.0-arduino17",ToolPackager:"arduino"}]
daemon INFO Adding libraries dir [dir: D:\Program Files (x86)\Arduino\libraries, location: ide]
daemon INFO Adding libraries dir [dir: C:\Users\Farhan\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.4\libraries, location: platform]
daemon INFO Adding libraries dir [dir: c:\Users\Farhan\Documents\Arduino\libraries, location: user]
daemon INFO Resolving include Wire.h for arch avr
daemon INFO   found better lib [lib: Wire, prio: 64C]
daemon INFO Resolving include SPI.h for arch avr
daemon INFO   found better lib [lib: SPI, prio: 64C]
daemon INFO Resolving include Adafruit_BMP280.h for arch avr
daemon INFO   found better lib [lib: Adafruit_BMP280_Library, prio: 517]
daemon INFO Resolving include Adafruit_Sensor.h for arch avr
daemon INFO   found better lib [lib: Adafruit_Unified_Sensor, prio: 3EB]
daemon INFO Resolving include TM1637TinyDisplay.h for arch avr
daemon INFO   found better lib [lib: TM1637TinyDisplay, prio: 643]
root ERROR Request repositories failed with error: Git could not be found at the expected path: 'D:\Program Files\Arduino IDE\resources\app\node_modules\dugite-no-gpl\git\cmd\git.exe'. This might be a problem with how the application is packaged, so confirm this folder hasn't been removed when packaging.
daemon INFO inventory.Store.ConfigFileUsed() c:\Users\Farhan\AppData\Local\Arduino15\inventory.yaml
daemon INFO inventory.Store.ConfigFileUsed() c:\Users\Farhan\AppData\Local\Arduino15\inventory.yaml
daemon INFO Searching tools required for board arduino:avr:nano
daemon INFO Required tool [tool: {ToolName:"arduinoOTA",ToolVersion:"1.3.0",ToolPackager:"arduino"}]
daemon INFO Required tool [tool: {ToolName:"avr-gcc",ToolVersion:"7.3.0-atmel3.6.1-arduino7",ToolPackager:"arduino"}]
daemon INFO Required tool [tool: {ToolName:"avrdude",ToolVersion:"6.3.0-arduino17",ToolPackager:"arduino"}]
daemon INFO Adding libraries dir [dir: D:\Program Files (x86)\Arduino\libraries, location: ide]
daemon INFO Adding libraries dir [dir: C:\Users\Farhan\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.4\libraries, location: platform]
daemon INFO Adding libraries dir [dir: c:\Users\Farhan\Documents\Arduino\libraries, location: user]
daemon INFO Resolving include Wire.h for arch avr
daemon INFO   found better lib [lib: Wire, prio: 64C]
daemon INFO Resolving include SPI.h for arch avr
daemon INFO   found better lib [lib: SPI, prio: 64C]
daemon INFO Resolving include Adafruit_BMP280.h for arch avr
daemon INFO   found better lib [lib: Adafruit_BMP280_Library, prio: 517]
daemon INFO Resolving include Adafruit_Sensor.h for arch avr
daemon INFO   found better lib [lib: Adafruit_Unified_Sensor, prio: 3EB]
daemon INFO Resolving include TM1637TinyDisplay.h for arch avr
daemon INFO   found better lib [lib: TM1637TinyDisplay, prio: 643]

[per1234]

the app takes few minutes too open

Thanks for taking the time to submit an issue.

I see we have another report about this at #385

It is best to have only a single issue per subject so we can consolidate all relevant discussion to one place, so I'll go ahead and close this in favor of the other.

If you end up with additional information to share, feel free to comment in the other thread.

splash screen is very annoying (stays on top while app is opening)

We are already tracking this here: #324
And there is a proposed fix here: #717
If you would like to try out that proposal (note that it is only for the splash screen, not the slow startup), you can download the tester build from the "Artifacts" section of this page:
https://github.com/arduino/arduino-ide/actions/runs/1618349447#artifacts