+- LDraw.org Discussion Forums (https://forums.ldraw.org)
+-- Forum: LDraw Programs (https://forums.ldraw.org/forum-7.html)
+--- Forum: LDraw Editors and Viewers (https://forums.ldraw.org/forum-11.html)
+--- Thread: [LDCad] Dropping Frame Rate when MPD View is open in Part Bin (/thread-29403.html)
Dropping Frame Rate when MPD View is open in Part Bin - Gerald Lasser - 2026-02-21
I had an intermittent issue with LDCad where i experienced an incredible drop in the frame rate, down to 1 fps from a 20 fps rendering.
This is with a file of 25.000 parts, many of them technic beams. I first thohought that the increased accuracy of the npegholes contributed to this effect, but now I found the real reason.
I use a number fo subfiles in this MPD and whenever I switch to the MPD view, because I need a file or want to select one and I stayed there, the framerate was very sluggish.
switching back ti a "normal" parts bin e.g.used parts or "brick"increased the frame rate massively.
Are you rendering the content of the small tiles inthe MPD view kind of real time? would there be a way to avoid this behaviour?
thansk
Gerald
RE: Dropping Frame Rate when MPD View is open in Part Bin - Roland Melkert - 2026-02-22
(2026-02-21, 23:16)Gerald Lasser Wrote: I had an intermittent issue with LDCad where i experienced an incredible drop in the frame rate, down to 1 fps from a 20 fps rendering.It renders whenever something related changes. eg an editing change or hot tracking in the same (partbin/colorbin/edit/source) region.
There are some things you can check:
- be sure the frame render method is fbo (prefs/Opengl)
- lower the cell count of the partbin (-/+)
- try disabling hottracking in partbins (prefs/gui)
RE: Dropping Frame Rate when MPD View is open in Part Bin - Gerald Lasser - 2026-02-22
(2026-02-22, 7:29)Roland Melkert Wrote: It renders whenever something related changes. eg an editing change or hot tracking in the same (partbin/colorbin/edit/source) region.
There are some things you can check:
- be sure the frame render method is fbo (prefs/Opengl)
- lower the cell count of the partbin (-/+)
- try disabling hottracking in partbins (prefs/gui)
The framerate is fine as long as I don't open the "File Content"/"All Models" in the Parts Bin.
My assumption is that this drives down the frame rate due to the generation of the preview imagesas you move parts around, as this might impact mere sub-models, a lot of the preview images are rendered
My question is more towards the direction if the rendering of the preview-images can be reduced, e.g.:
- only once a part has been placed, or e.g. a second after a part has been placed.
- only after you press "end" of "Ctrl-End", i.e. render them only once.
Form smaller models the current state is no issue at all, as a few hundred parts are fine.
RE: Dropping Frame Rate when MPD View is open in Part Bin - Roland Melkert - 2026-02-24
(2026-02-22, 13:16)Gerald Lasser Wrote: My question is more towards the direction if the rendering of the preview-images can be reduced, e.g.:
- only once a part has been placed, or e.g. a second after a part has been placed.
- only after you press "end" of "Ctrl-End", i.e. render them only once.
It currently invalidates all depended renderings whenever something changes (new part,part move,color change, etc).
But I guess I could add some kind of option to disable real-time updates for part bin cells, I will look into it.
RE: Dropping Frame Rate when MPD View is open in Part Bin - Gerald Lasser - 2026-02-24
(2026-02-24, 20:12)Roland Melkert Wrote: It currently invalidates all depended renderings whenever something changes (new part,part move,color change, etc).
But I guess I could add some kind of option to disable real-time updates for part bin cells, I will look into it.
Thanks for considering it.
It is basically working for me now as I know what to do, respectively watch which bin is open, but till I reached that point :-)
RE: Dropping Frame Rate when MPD View is open in Part Bin - SNIPE - 2026-02-26
I also get this, on a brand new high end PC