I exported a 4K UI cutout and imported it into UMG. The image is now outside the preview window and resizing. After adjusting the DPI (setting it to 1 for 4K and 0.5 for 1080P), it’s back to normal. Is this correct? Also, will this affect game performance?
There are multiple reasons we want to avoid that, other than performance. First, the file size. 4k texture is a really huge file size. Everything that requires instant access during runtime will load into RAM. Imagine you have tons of these textures used inside your game UI. Compressing it will negate all the reasons for using the 4k texture in the first place. I would suggest keeping it 1k, if it’s small, go for 512px or 256px.
Second is loading those 4k assets into memory/RAM will surely increase the load time and game size. Even if you don’t use it. I’m not sure about this, but I don’t think decreasing the DPI will help, as it still loads the 4k texture on the screen first before it decreases the DPI or whatever that is.