I have noticed that indeed the File integrity scan takes serious performance of the disk:
Total DISK READ : 3.20 M/s | Total DISK WRITE : 1012.79 K/s
Actual DISK READ: 13.16 M/s | Actual DISK WRITE: 311.63 K/s
So I want to change the schedule and cannot find any option to change this.
The file integrity must get a hash value of every file to know if any of them have changed. Obviously this needs server resources, but this task should take only a few seconds.
All tasks automatically launched are conducted by cron (Configuration -> cron Configuration). You can also disable cron from main panel of Securitycheck Pro.