diff --git a/Project.toml b/Project.toml
index 9ca0b74e0c..11be615268 100644
--- a/Project.toml
+++ b/Project.toml
@@ -2,7 +2,7 @@ name = "Pluto"
 uuid = "c3e4b0f8-55cb-11ea-2926-15256bba5781"
 license = "MIT"
 authors = ["Fons van der Plas <fonsvdplas@gmail.com>", "Mikołaj Bochenski <iceflamecode@gmail.com>"]
-version = "0.8.0"
+version = "0.8.1"
 
 [deps]
 Base64 = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
diff --git a/README.md b/README.md
index 0cf6d0689c..df6b4ec8be 100644
--- a/README.md
+++ b/README.md
@@ -102,7 +102,7 @@ We are happy to say that Pluto.jl runs smoothly for most users, and is **ready t
 
 That being said, the Pluto project is an ambition to [_rethink what a programming environment should be_](http://worrydream.com/#!/LearnableProgramming). We believe that scientific programming can be a lot simpler. Not by adding more buttons to a text editor — by giving space to creative thought, and automating the rest. 
 
-If you feel the same, give Pluto a try! We would love to hear your what you think. 😊
+If you feel the same, give Pluto a try! We would love to hear what you think. 😊
 
 <img alt="feedback screencap" src="https://user-images.githubusercontent.com/6933510/78135402-22d02d80-7422-11ea-900f-a8b01bdbd8d3.png" width="70%">
 
diff --git a/assets/editor.html b/assets/editor.html
index cdbe0f2ae3..41c6a5df0f 100644
--- a/assets/editor.html
+++ b/assets/editor.html
@@ -267,8 +267,12 @@
             position: relative;
         }
 
-        body.loading>main>preamble>button {
-            opacity: 0%;
+        main>preamble>button {
+            display: none;
+        }
+        
+        body.code-differs>main>preamble>button {
+            display: block;
         }
 
         cell {
@@ -360,8 +364,8 @@
             pointer-events: none;
         }
 
-        button.runall>span::after {
-            content: "Run all ▶▶";
+        button.runallchanged>span::after {
+            content: "Submit all changes ▶▶";
         }
 
         button.addcell>span::after {
@@ -644,7 +648,7 @@ <h1>
 
     <main>
         <preamble>
-            <button class="runall" title="Run all"><span></span></button>
+            <button class="runallchanged" title="Save and run all changed cells"><span></span></button>
         </preamble>
         <notebook>
         </notebook>
diff --git a/assets/editor.js b/assets/editor.js
index 88f544286b..45526c3bd1 100644
--- a/assets/editor.js
+++ b/assets/editor.js
@@ -27,8 +27,8 @@ function updateRemoteNotebooks(list) {
 
 /* DOM THINGIES */
 
-document.querySelector("preamble>button.runall").onclick = (e) => {
-    requestRunAllRemoteCells()
+document.querySelector("preamble>button.runallchanged").onclick = (e) => {
+    requestRunAllChangedRemoteCells()
 }
 
 cellTemplate = document.querySelector("#celltemplate").content.firstElementChild
@@ -88,7 +88,7 @@ window.localCells = {}
 window.codeMirrors = {}
 
 function createCodeMirrorInsideCell(cellNode, code) {
-    var editor = CodeMirror((elt) => {
+    var cm = CodeMirror((elt) => {
         cellNode.querySelector("cellinput").appendChild(elt)
     }, {
         value: code,
@@ -107,10 +107,10 @@ function createCodeMirrorInsideCell(cellNode, code) {
         matchBrackets: true,
     });
 
-    window.codeMirrors[cellNode.id] = editor
-    //editor.setOption("readOnly", true);
+    window.codeMirrors[cellNode.id] = cm
+    //cm.setOption("readOnly", true);
 
-    editor.setOption("extraKeys", {
+    cm.setOption("extraKeys", {
         "Ctrl-Enter": () => requestChangeRemoteCell(cellNode.id),
         "Shift-Enter": () => {
             requestNewRemoteCell(indexOfLocalCell(cellNode) + 1)
@@ -127,16 +127,15 @@ function createCodeMirrorInsideCell(cellNode, code) {
         "Tab": onTabKey,
     });
 
-    editor.on("change", (cm, change) => {
+    cm.on("change", (cm, change) => {
         // TODO: optimise
-        if (cm.getValue() != cellNode.remoteCode) {
-            cellNode.classList.add("code-differs")
-        } else {
-            cellNode.classList.remove("code-differs")
-        }
+        const differs = cm.getValue() != cellNode.remoteCode
+
+        cellNode.classList.toggle("code-differs", differs)
+        updateAnyCodeDiffers()
     })
 
-    editor.on("cursorActivity", (cm) => {
+    cm.on("cursorActivity", (cm) => {
         const token = cm.getTokenAt(cm.getCursor())
 
         if (token.type != null && token.type != "string") {
@@ -144,7 +143,11 @@ function createCodeMirrorInsideCell(cellNode, code) {
         }
     });
 
-    return editor
+    return cm
+}
+
+function updateAnyCodeDiffers(hint=false) {
+    document.body.classList.toggle("code-differs", hint || (document.querySelector("notebook>cell.code-differs") != null))
 }
 
 function prettytime(time_ns) {
@@ -285,6 +288,7 @@ function updateLocalCellInput(byMe, cellNode, code, folded) {
         cellNode.classList.remove("code-differs")
     }
 
+    updateAnyCodeDiffers()
     foldLocalCell(cellNode, folded)
 }
 
@@ -422,31 +426,38 @@ function requestChangeRemoteCell(uuid, createPromise = false) {
     return client.send("changecell", { code: newCode }, uuid, createPromise)
 }
 
-function requestRunAllRemoteCells(setInputs = true) {
-    if (!window.allCellsCompleted) {
-        return
-    }
+function requestRunAllChangedRemoteCells() {
     refreshAllCompletionPromise()
-    const promises = []
 
-    for (var uuid in window.localCells) {
-        const cellNode = window.localCells[uuid]
+    const changed = Array.from(notebookNode.querySelectorAll("cell.code-differs"))
+    const promises = changed.map(cellNode => {
+        const uuid = cellNode.id
         cellNode.classList.add("running")
-        if (setInputs) {
-            promises.push(
-                client.sendreceive("setinput", {
-                    code: window.codeMirrors[uuid].getValue()
-                }, uuid).then(u => {
-                    updateLocalCellInput(true, cellNode, u.message.code, u.message.folded)
-                })
-            )
-        }
-    }
+        return client.sendreceive("setinput", {
+            code: window.codeMirrors[uuid].getValue()
+        }, uuid).then(u => {
+            updateLocalCellInput(true, cellNode, u.message.code, u.message.folded)
+        })
+    })
     Promise.all(promises).then(() => {
-        client.send("runall", {})
+        client.send("runmultiple", {
+            cells: changed.map(c => c.id)
+        })
     }).catch(console.error)
 }
 
+function requestRunAllRemoteCells() {
+    refreshAllCompletionPromise()
+
+    const uuids = Array.from(window.localCells).map(cellNode => {
+        cellNode.classList.add("running")
+        return cellNode.id
+    })
+    client.send("runmultiple", {
+        cells: uuids
+    })
+}
+
 function requestInterruptRemote() {
     client.send("interruptall", {})
 }
@@ -560,7 +571,7 @@ function onEstablishConnection() {
             if (runAll
                 && !document.querySelector("notebook>cell.running")
                 && document.querySelector("notebook>cell.output-notinsync")) {
-                requestRunAllRemoteCells(false)
+                requestRunAllRemoteCells()
                 window.allCellsCompletedPromise.then(happy)
             } else {
                 // We do a code completion request to trigger starting the workpsace
diff --git a/assets/light.css b/assets/light.css
index f8f21146d8..3154004186 100644
--- a/assets/light.css
+++ b/assets/light.css
@@ -160,8 +160,8 @@ preamble>button {
 preamble>button>span::after {
     background-size: 17px 17px;
     display: block;
-    content: "Run all" !important;
-    background-image: url(https://cdn.jsdelivr.net/gh/ionic-team/ionicons@5.0.0/src/svg/play-skip-forward-circle-outline.svg);
+    content: "Submit all changes" !important;
+    background-image: url(https://cdn.jsdelivr.net/gh/ionic-team/ionicons@5.0.0/src/svg/sync-circle-outline.svg);
     background-repeat: no-repeat;
     background-position-x: right;
     background-position-y: 1px;
diff --git a/sample/ui.jl b/sample/ui.jl
index 4d9bf3b3c9..8ab1be3e95 100644
--- a/sample/ui.jl
+++ b/sample/ui.jl
@@ -109,7 +109,6 @@ function onmove(e){
 }
 
 canvas.onmousedown = e => {
-	console.log(e)
 	startX = e.layerX
 	startY = e.layerY
 	canvas.onmousemove = onmove
diff --git a/src/notebookserver/Notebook.jl b/src/notebookserver/Notebook.jl
index 097611c9f7..7b0dddb706 100644
--- a/src/notebookserver/Notebook.jl
+++ b/src/notebookserver/Notebook.jl
@@ -24,13 +24,8 @@ end
 Notebook(path::String, cells::Array{Cell,1}) = Notebook(path, cells, uuid1())
 Notebook(cells::Array{Cell,1}) = Notebook(tempname() * ".jl", cells)
 
-function selectcell_byuuid(notebook::Notebook, uuid::UUID)::Union{Cell,Nothing}
-    cellIndex = findfirst(c->c.uuid == uuid, notebook.cells)
-    if cellIndex === nothing
-        @warn "Requested non-existing cell with UUID $(uuid)\nTry refreshing the page in your browser."
-        return nothing
-    end
-    notebook.cells[cellIndex]
+function cellindex_fromuuid(notebook::Notebook, uuid::UUID)::Union{Int,Nothing}
+    findfirst(c->c.uuid == uuid, notebook.cells)
 end
 
 # We use a creative delimiter to avoid accidental use in code
diff --git a/src/webserver/Dynamic.jl b/src/webserver/Dynamic.jl
index 6effaab843..cb416720a0 100644
--- a/src/webserver/Dynamic.jl
+++ b/src/webserver/Dynamic.jl
@@ -184,8 +184,10 @@ responses[:run] = (body, notebook::Notebook, cell::Cell; initiator::Union{Initia
     run_reactive_async!(notebook, cell)
 end
 
-responses[:runall] = (body, notebook::Notebook; initiator::Union{Initiator, Missing}=missing) -> begin
-    run_reactive_async!(notebook, notebook.cells)
+responses[:runmultiple] = (body, notebook::Notebook; initiator::Union{Initiator, Missing}=missing) -> begin
+    indices = cellindex_fromuuid.([notebook], UUID.(body["cells"]))
+    cells = [notebook.cells[i] for i in indices if i !== nothing]
+    run_reactive_async!(notebook, cells)
 end
 
 responses[:getinput] = (body, notebook::Notebook, cell::Cell; initiator::Union{Initiator, Missing}=missing) -> begin
diff --git a/src/webserver/WebServer.jl b/src/webserver/WebServer.jl
index b37a3dff05..47e8124966 100644
--- a/src/webserver/WebServer.jl
+++ b/src/webserver/WebServer.jl
@@ -278,14 +278,12 @@ function process_ws_message(parentbody::Dict{String, Any}, clientstream::HTTP.We
         end
 
         if haskey(parentbody, "cellID")
-            cell = let
-                cellID = UUID(parentbody["cellID"])
-                selectcell_byuuid(notebook, cellID)
-            end
-            if cell === nothing
+            cellID = UUID(parentbody["cellID"])
+            index = cellindex_fromuuid(notebook, cellID)
+            if index === nothing
                 @warn "Remote cell not found locally!"
             else
-                push!(args, cell)
+                push!(args, notebook.cells[index])
             end
         end