Thanks Doom! For me:
CPU - Intel i7 9750H
GPU - GPU Intel(R) UHD Graphics 630 7.9 GB
RAM - 16 GB
Display Resolution - 3840 x 2160
OK! I have received word from our sage counsel in the Tech team.
PLEASE ONLY FOLLOW THIS IF YOU HAVE AN INTEL CPU! If you're not sure, don't risk it. Non-Intel users may see negative performance impacts with no visible gain.
We have debug option to disable a graphical setting we believe may be causing graphical artifact issues on some Intel hardware setups.
It can be force disabled using the console command: rendercapoverride_set 3 1 , then restarting the application. It will persist across reboots.
If issues are experienced after disabling, it can be re-enabled using rendercapoverride_set 3 0, or all graphics settings can be cleared on Windows by deleting the Settings.jcache files in %LOCALAPPDATA%/Jagex/RuneScape
Again, please only attempt to use the above if you have an Intel CPU, but I hope that if you do, it can help in the interim while the team...
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