FabFilter User Forum

ProQ4 causing big lag in ProTools when sliding clips left and right

Hi,

I'm running ProTools 2025.12.1 on Windows 10. When I have ProQ4 inserted on a track, Protools has a lag when dragging clips left and right. The more tracks with ProQ4, the more lag. I have a session with 54 tracks and ProQ4 is inserted on all of them. When I group the tracks to edit and slide, ProTools takes about 10 seconds from when I let go of my mouse until the tracks complete moving to the new location.

This behavior happens even when ProQ4 is inactive on a track. If I remove all the instances of ProQ4, sliding clips dramatically improves and behaves normally. Other FabFilter plugins don't cause the lagging issue as much. I have ProC2 inserted and PT has no lag.

I've tried turning off delay comp, change track view to blocks, nothing helps. I've done a lot of experimenting to narrow it down to ProQ4. It must be taking CPU time or something even while inactive.

Any suggestions? For now I'm doing all my editing without ProQ4 in the session and I'll load it for mixing if I need it.

Thanks.

David Sandwisch
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