Check the file system activity in the monitor. CPU max frequency in case it has something to do and there is no overheating. You have checked the last, so it should be the first. In case your source material (audio files, samples, etc.) is on relatively slow media (I hope there is no problems with the disk, but the effect can be from there), the CPU is waiting and has no reason to max.
If you use HDD, check the fragmentation level (not important for SDD). Or it could be some background activity which keeps the disk busy.
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