Certain visual effects running choppily after long play sessions

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On my Oneplus 6T, certain transparent animated visual effects have a juttery look to them, seemingly getting gradually worse after looking at a large amount of such effects in one play session until they appear to be animating at one frame per second. A few examples I've seen:
  • The glowing mist effect behind non-common cards when opening kegs.
  • The glowing mist effect behind selected options in the main menu.
  • The spiraling portal when queueing for an Arena match.
  • The mist at the bottom of the screen when in an Arena menu.
  • Various effects in premium card art, like the spiraling magic in the background of Damned Sorceress, the water in Water of Brokilon, and the mist in Azar Javed.
 
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