# Preform Processing Slow **URL:** \ **Category:** Support & Troubleshooting\ **Created:** [December 11, 2018, 6:51pm UTC](https://forum.formlabs.com/t/preform-processing-slow/21505 "2018-12-11T18:51:21Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![mikrubin](https://avatars.discourse-cdn.com/v4/letter/m/f475e1/32.png) [@mikrubin](https://forum.formlabs.com/u/mikrubin)\ **Post date:** [December 11, 2018, 6:51pm UTC](https://forum.formlabs.com/t/preform-processing-slow/21505/1 "2018-12-11T18:51:21Z")
I have Preform v2.19.1.bld\_745 running on an iMac v10.13.6 with 3.5Ghz 7 cores and 1TB of SSD memory. During the “Generated Selected” supports process (resin = black) the CPU maxes out for about 3-5 seconds (between 250%-650%) and then levels off to 102%… and then sluggishly plugs along for another 10 minutes to generate a simple set of supports. It appears that it is not using all cores during the entire generation process. In the log, I am seeing a bunch of: Thread QoS Default, Requested Thread QoS Default\> So it looks like there is some sort of quality-of-service ramping down the threading, resulting in less CPU usage. I am guessing that this, in turn, is slowing down the gratin process. Likewise the check for printability process. Can this be rectified to increase CPU usage, resulting in a faster processing? And it would be nice to have a “Preference” option to tell Preform to use or not use all cores of the computer (leave it to the user’s discretion). ---
**Author:** ![system](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/b/5bc2bdf993ff27c2e0eecab5010b25626fbb327a.png) [@system](https://forum.formlabs.com/u/system)\ **Post date:** [December 25, 2018, 6:51pm UTC](https://forum.formlabs.com/t/preform-processing-slow/21505/2 "2018-12-25T18:51:24Z")
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