Particle system and uncapped framerate

This is an old topic but it continues in 2017.1 and I want some input from Richard or Karl. Someone told me to turn off FPS limit (Application.targetFrameRate) and v-sync for testing performance, the result is that particles emitted over distance distributed unevenly (clump together into tumors) during run-time or in Windows build.

If it is a bare scene with just 1 single particle system, the problem is not noticeable. But when more scene objects are added, the issue starts to occur to random particle system. I suspected it was particles being emitted excessively, but the particle count during runtime suggests otherwise.



I could just cap my framerate and all issues are gone, but it still bugs me.

 

If you believe this is a bug in Unity, I recommend to submit a bug-report following the advice in this document, to prevent that this issue continues to appear in future Unity releases.

Using the bug-reporter seems to be an important step, because it makes sure the report is in Unity Technologies bug-tracking pipeline and has to be processed at some point. Using the forum is often used to add to a little more attention to a bug-report, but does not replace actually submitting a bug-report.

It's from advantage to attach a project to the bug-report that UT can use to reproduce the issue and test their fix against. The easier an issue can be reproduced by QA, the more likely it is to get forwarded to a developer, who might or might not work on a bug-fix for that at some point.

After you submitted the bug-report, you receive a confirmation email with a Case number. UT often asks us to post the Case number in the forum thread, which allows them to find that bug-report if they look at your post.

Following these steps will increase the chance that UT is looking at your issue tremendously.