Updates shouldn't bring your box regulyrly every 15mins to 100% CPU usage. I guess it's the reporting (rrd graphs etc.) Try to set your keeping times for reporting data from 3month ( is default if I remember right) to as low as possible values. Probably a week, in best case 1 month. Especially firewall and webfilter data, and Accounting...
Should get better within 12 hours, ast the DBs gets cleaned up every 12 h
/Sascha
Wer Schreibfehler findet, darf sie behalten. Wenn ich via IPad poste, sind Verschreiber und grammatikalische Aussetzer irgendwie an der Tagesordnung.