Via [url=https://steamcommunity.com/games/CSGO/announcements/detail/4199120329626448731]the Steam Community[/url]:

[quote=Valve][b][u]MISC[/u][/b]
- Grenade kills no longer display the "in-air" killfeed icon.
- Fixed several cases where clicking on the buy menu or scoreboard would cause the game to stop taking keyboard input.
- Fixed too many usercommands being processed when skipping forward in demos. This reduces the skip time by as much as 80%.
- Added console output that may be helpful for advanced users to diagnose performance problems. When a very long frame occurs, a brief profile of the frame is printed. At the end of a match, a summary is printed.[/quote]

Rumor has it:

- [b]Caution for FACEIT players: after this update, having FACEIT's anti-cheat solution running will cause the game to crash[/b]
- The workaround is to exit it, but obviously if you wish to play on FACEIT's servers, you'll need to wait for them to update their anticheat

- Said console command if you wish to take a crack at diagnosing your own performance problems is: cl_frametime_summary_report_detailed

- Size is ~210 MB (with Workshop Tools installed)