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<blockquote data-quote="Owlsroost" data-source="post: 656331" data-attributes="member: 83973">You're right - the problem with the Windows timers seems to be that they all run at a low-ish priority level, so they are fairly accurate most of the time, but it only takes a high-priority task etc to be scheduled by windows =&gt; the scheduler thread has just been asleep for 10-20ms longer than it should have been....at which point it probably has to drop a frame....I added the 'timer' thread to try and get two delay timers using completely different mechanisms running in parallel, on the basis that if one timer got messed up the other one might still be OK - it does seem to help but it costs some CPU time of course. For info, on the render stats screen, 'Derr:' is the difference between actual time delay versus the target.It's good to have someone running an Atom/ION system digging into the code - welcome aboard <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />Tony</blockquote>

[QUOTE="Owlsroost, post: 656331, member: 83973"] You're right - the problem with the Windows timers seems to be that they all run at a low-ish priority level, so they are fairly accurate most of the time, but it only takes a high-priority task etc to be scheduled by windows => the scheduler thread has just been asleep for 10-20ms longer than it should have been....at which point it probably has to drop a frame.... I added the 'timer' thread to try and get two delay timers using completely different mechanisms running in parallel, on the basis that if one timer got messed up the other one might still be OK - it does seem to help but it costs some CPU time of course. For info, on the render stats screen, 'Derr:' is the difference between actual time delay versus the target. It's good to have someone running an Atom/ION system digging into the code - welcome aboard :) Tony [/QUOTE]

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