They are addressing the issue:
If anybody has any .rblx files that repro this problem, please send them my way.
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I took a free model gun and added particle effects to the bulletholes.
when you spray the wall, you can see the particles render properly, but after spamming it for a while, it seems they go into a buffer, and some show up a few seconds after shooting.
In the later half of the video, my mouse is up.
particle_repro.rbxl (75.5 KB)
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Thank you so much, super helpful!
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Yeah, this is fantastic. Reproduces instantly every time – this’ll help me debug this a lot quicker. Thank you POOPENGUIN.
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I have a fix for this. I’m working with others within Roblox to get this out as promptly as I can. My apologies everybody!
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I’ve also noticed that lights such as surface lights are delayed too. Some will turn on on prompt and some will take a few seconds to turn on even though they all turn on at the same time.
I’m having the same problem, in the first few seconds of video the effect is reproduced correctly, but after a while I use the attack again, and the effect comes out with a delay, and it only happens with particles
Hoping this can be fixed today
I’m having quite a similar problem and it’s with Emit()
This bug seems to be related to the Particles not being in the viewport somehow, or they at least act as if they’re not in the player’s view.
The issue of the particles randomly deciding to not show up and then reappear, i.e. rapidly firing a gun into a wall with sparks, and then appear shortly after not firing anymore, seems to be a related issue.
As demonstrated in this video:
I hope this gets fixed soon, i got an update ready for my game but cant publish it because all the effects are glitched.
same, I should have updated my game 10 days ago. everyone keep asking why I didn’t update it and when will I update my game
I never really thought of checking the engine bugs category until now. I kept thinking I messed up something for over a week and couldn’t fix it. Thank you for your post!
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It’s been 2 weeks now since the problem first appeared. it really affect my game. Particle, Beam, Lighting, and performance are all got affected. hopefully this will be fixed ASAP 
This issue is affecting games that use particles heavily in such a negative way that it hurts the players and the developers greatly. “The Zombie’s Onslaught” uses particles, beams, and trails alike, and they’re all delayed heavily the moment that they start getting heavily used. In turn, this affects the performance of everybody inside the game and it makes visual cues using such assets unreliable.
A fix needs to happen soon. It’s quite obnoxious that it hasn’t been fixed yet.
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It’s a shame. Staff claimed that they had a fix for it… Nine days ago. Some experiences are beginning to be unplayable for some users.
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Indeed. If a game relies on particles as much as TZO does to show attacks, some people are essentially taking damage from something they can’t even see.
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Based on responses above it seems like the fix didn’t end up going out before/during the holidays, probably because of code freeze(?)
Appreciate the vigor in working on the new particle stuff, but this should really have been shipped with proper on/off switches, and if an on/off switch wasn’t feasible, it simply shouldn’t have shipped as close to the holiday period as it did.
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It really is disappointing that Roblox still has not fixed this issue. This has completely delayed development on games I have been trying to finish.
Last thing we heard from Roblox on this issue is that there was a fix, which doesn’t seem to work if it’s been already released. Its been about 3 weeks since this issue has started for me, and I cant work on anything until its fixed. Very much a shame.
Hope to hear back from Roblox soon.
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