Unfortunately it’s related only to the disk’s ability to add bytes to the SQLite database as fast as possible when it’s struggled with other load. The CPU usually doesn’t matter much, unless your Mobo is totally relay only on CPU for any I/O operations, i.e. “windows only” Mobo or a software emulation… Usually the read-write cache should help here. If you use Linux and can add more RAM, it likely will be resolved itself. The alternative is to move databases to another disk, SSD for example (or even USB stick as suggested by several Community members if you wouldn’t mind to lose the history and the stat if it would die) or adding SSD as a cache layer (a special device in case of ZFS or SSD layer in case of LVM or Primocache in case of Windows, actually you may also use a tiered Storage Spaces in Windows too). For Windows you may also enable a write cache in the disk properties, if you have UPS (you need to select both checkboxes there):