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"Troubleshooting Game Performance Issues - Hardware"
https://support.steampowered.com/kb_article.php?ref=9257-TUJL-7421
"Troubleshooting Game Performance Issues - Software"
https://support.steampowered.com/kb_article.php?ref=9257-TUJL-7421
is about in-game mouse-lag, it's another old thread with brand new replies. Perhaps one of 2 solutions provided in the lasts comments might direct you to the solution you need. Particulary the one about uninstalling the window snap tool "Magnet" since you already seem to know your issue is with a 3rd party program.