My system specs:


I do not know if this is a bug perse or an issue with memory management,
since this does not happen with DEEPSEA 12.13.

Loading a large map into DB2r1250, as for example map02 or map03 of PARANOID,
there is a perceptible lag when dragging the map across the screen or when
zooming in and out, which is quite annoying.

I'm just wondering if this could be improved somehow.

Looks like it has something to do with the unknown flats. If you disable flat drawing, or set the flats to something known, drawing will be fast again.

Ah, thank you.
As I was loading patches, textures and flats into the map, the panning delay did become bearable.
So it is just a memory management issue.

By that statement I assume you looked at the code and found the problem. Please tell me where it is.

I looked at the code myself and I can't see anything wrong. But I don't have an profiler so I can't tell where it takes its time when redrawing.

It becomes slow when it cannot find the flats (or other type of image) it needs to render. It renders the questionmark image instead, but getting that questionmark image somewhere makes it slow. It is not a memory issue, but a performance issue with the questionmark image. I have looked into this before (I think it unnecessarily makes a copy of it in memory when it renders it or some bullshit like that) and considered it too much work to properly fix it, compared to how much of a problem it actually is (You should just load textures/flats and you're fine).