-high +fps_max 0
CS:GO won't broadcast the server you're connected to if you're playing on a community server.
By default self-hosting a server will always launch in 64 tickrate.
Special singleplayer map that allows you to configure settings that aren't normally accessible via in-game UI.
See the official Steam support page here
If you get this error message without have used any 3rd party applications, this quick fix should solve your issue.
None - Opt out of all beta programs
C:\Program Files (x86)\Steam\bin\Steamservice.exe /Install
Maps using ambient occlusion (e.g. de_lake, de_canals, ar_baggage) can be very dark on Intel HD Graphics.
  Problem visualized here
Some people report that games run worse (not only CS:GO). It is also known that the AU update broke graphics card drivers.
Should be noted that an update for the game was released which added a warning for users who have XboxDVR enabled.
Help & Options
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