https://devzone.nordicsemi.com/f/nordic-q-a/124252/windows-unusable-when-nrf-connect-runs-a-buildWith SDK 3.0.2 and 3.1.0 we noticed that during a build, even a 10-core i7 becomes almost unusable. The reason seems to be that all cc1.exe compiler processes run at normal priority instead of below normal . Currently, we have to rely on a paid 3rden-USTelligent Community 13Tue, 09 Sep 2025 14:32:44 GMThttps://devzone.nordicsemi.com/thread/548257?ContentTypeID=1Tue, 09 Sep 2025 14:32:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:70868a19-a1e6-465f-9334-2d9f9f257d6aRessa<p>Hi,&nbsp;<br /><br />By unusable you mean you cannot do any other things at all? Have you checked to see if antivirus / windows defender is consuming too much CPU during build ? In that case you can exclude the build directory /<span>nRF Connect/ NCS folders from antivirus and it can help a lot.&nbsp;<br /><br /></span>Best regards,<br />Ressa<br /><br /></p><div style="clear:both;"></div>