Upgrade Intel performace: Pre-release Notes for 4/4/2020

A new build (“old_intel_perf_fix”) is now available in the CS:GO beta depot.

For instructions on how to opt into a CS:GO beta depot build, visit the following page: https://support.steampowered.com/kb_article.php?ref=9847-WHXC-7326

[MISC]
– Added a launch option -noubershader. Users on very old Intel hardware can set this launch option to improve their framerate. This option is not recommended otherwise as it is likely to cause stuttering on the overwhelming majority of GPUs.