I had a problem for a while, with PHPStorm being laggy on ubuntu (had this 
problem for over a year)
Recently lag became unusable, after I tweaked a few things in ubuntu config (i 
think I increased swappiness)
In Intellij discussion they linked to this linux kernel ticket.

Lags in a way of:
Phpstorm window freezes for 5 seconds
sometimes phpstorm does not unfreeze, need to kill the process
laggy scrolling inside Phpstorm file window
sometimes freezes inside settings menus
laptop fan spins up audibly more than usual
google chrome can become laggy while running phpstorm

Ubuntu 18.04, kernel 5.3.0-51
pc: lenovo t480, 
graphics: intel 620
CPU: Intel® Core™ i5-8250U CPU @ 1.60GHz × 8


Could not figure out how to upgrade kernel version, because I already had 
stable one

Upgrade to 19.10 did not help, kernel stayed the same version

After I did upgrade to 20.04, it seems so far that problems disappeared.
Now kernel is 5.4.0-29-generic

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https://bugs.launchpad.net/bugs/1872001

Title:
  5.3.0-46-generic - i915 - frequent GPU hangs  / resets rcs0

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