try verify the install first (in the Launcher there is a down arrow on the engine tile, and one of the options “should be” “verify”
this will do a check sum on the install of the engine, and determines what parts are “damaged” and retrieve those, limiting the size/time relative to just re-downloading the whole engine again.
for the computer itself:
your fiend what hardware are they running? is it markedly different to yours in tiers?
could you send them the project you are experiencing this issue with and see if they experience the same?
could you include some steps from a template that re-creates this situation. as few steps as possible, and either post the steps you took, or zip the project files and upload those somewhere? (the zip file is probably not the greatest as virus/trust things, but someone might look at it to see if they experience similar)
are you experiencing random colored triangles?
things persisting for a second of 2 after they should be gone in other applications/games?
The worst case “random rainbow triangle spaghetti” (you will know it if you see it, so if you haven’t seen this then ‘don’t worry about it’)
if you open up task manager while the Engine is running and go to “Performance” then select your GPU; look at the Core usage, and VRAM are these close to the max values. at which point your answers are “work within those envelopes” or “maybe upgrade”
When I say “maybe upgrade” I don’t mean go out and buy a brand newest Quadro or 4090 SUPER TI (I know this is currently not a real product…) but you could look at something 1 or 2 generations old toward the top of the stack. the good news is that often times when new GPUs are released it can reduce the price of cards lower in the stack and of previous generations. Generally for NVidea “try” to stay XX60 or higher, though XX70+ should be “OK” for AMD their tier-numbers can be all over the place. I know Intel has a GPU division, but they have still not released their latest generation since the NVidea 30XX series, and I haven’t seen concrete what those new cards will even be.
So, look into more current reviews which will often include cards of previous generations particularly for those upgrading even though you might be looking at those “as the upgrade”
for your current card you could keep it (assuming it still generally works) as a performance benchmark target for your own project(s) when you are closer to release, to see if you are OK with the performance on the “lower hardware” or if you need to suggest something higher.