add advice on video compression

source/guides/guides/screenshots-and-videos.md

@@ -43,6 +43,38 @@ When using the `--record` flag while running your tests, videos are processed, c
 
 Cypress clears any existing videos before a `cypress run`. If you do not want to clear your videos folder before a run, you can set {% url `trashAssetsBeforeRuns` configuration#Videos %} to `false`.
 
+## Video encoding
+
+If your specs are long, you might notice a time gap between a finished spec and a new spec starting. Cypress is encoding the captured video and possibly uploading it to the Dashboard. If the machine is encoding video slowly (which is often the case for virtual machines that use a single core), the encoding might take long time. In this case, you can modify the {% url `videoCompression` configuration#Videos %} parameter to make the encoding a little bit faster. Here are the common scenarios:
+
+**Use minimal compression**
+
+```json
+{
+  "videoCompression": 0
+}
+```
+
+The video will be larger, but the processing should be faster.
+
+**Disable compression**
+
+```json
+{
+  "videoCompression": false
+}
+```
+
+The compression step will be skipped completely, the video will be large.
+
+{% note info %}
+If you are a `ffmpeg` pro, and want to see all the settings and debug messages during the encoding, run Cypress with the following environment variable:
+
+```text
+DEBUG=cypress:server:video cypress run ...
+```
+{% endnote %}
+
 # Now What?
 
 So you are capturing screenshots and recording videos of your test runs, now what?