Roblox animations slowing down game

Bug Reports Engine Bugs
#1

I was working on my game and noticed that my FPS started to drop, while few seconds ago my FPS was stable 58.

After a while I found out that this problem is caused by roblox animations. After some more investigation, I found out that AnimationTracks cannot be stopped, which probably is reason for this sudden performance loss.

You can try to reproduce this by yourself in this place:

In that place, just spam Insert key to spawn particle explosion. Each explosion contains 50 particles, and by spamming insert key, you can end up with 500 concurrent particles. Before animating a character the FPS stays pretty much constant, but after animating, FPS will drop fast, by spamming same particle explosions.

Edit: Step by step repro, because of unclear instructions:

  1. Get the place.
  2. Play solo it, and spam Insert key. FPS shouldn’t drop much.
  3. Press ‘Animate dummy’.
  4. Spam Insert key again. Do you get different FPS?
#2

I can’t seem to reproduce this issue. My fps is staying at ~60 the entire time.

#3

Any while true do loops in there? I remember having an infinite loop in a place one time that oddly didn’t crash the test game, but instead gave really low FPS.

#4

The issue here is that my code handles 500 particles without a problem, but after you play animation it starts struggling with same ammount of particles.

And sparker, did you just hold mouse button or spam insert?

#5

Well, the first problem is that you’re using AnimationTrack::Stopped(), which is depreciated, and I don’t believe will ever work. You want AnimationTrack::KeyframeReached(string keyframeName).

But… even if you use that, it doesn’t work. Maybe some kind of throttling is going on? But that shouldn’t interrupt the events. I also can’t reproduce the degradation of performance even running it in a fast loop in the script. But, regardless, something funny is going on, I’ll look into what exactly is up.

#6

[quote] Well, the first problem is that you’re using AnimationTrack::Stopped(), which is depreciated, and I don’t believe will ever work. You want AnimationTrack::KeyframeReached(string keyframeName).

But… even if you use that, it doesn’t work. Maybe some kind of throttling is going on? But that shouldn’t interrupt the events. I also can’t reproduce the degradation of performance even running it in a fast loop in the script. But, regardless, something funny is going on, I’ll look into what exactly is up. [/quote]

Hmm strange, because that happens every time to me. Probably something to do with rendering, as I only have nvidia GT 620. And also one not space specific, since at first I faced this issue in other place.

Edit: Also yeah, even more sure that it has something to do with roblox internals, as my overall FPS drops, so it’s not my game loop that just get’s slower.