Switching tabs in Firefox 18.104.22.168 results in a high CPU load (90-98%) of guard.exe. This high CPU load keeps on going for at least 10 seconds (and slows down my system) until dropping down to 0. With Ewido 4.0 I didn't had any problems with the high CPU load in Firefox when switching tabs, but after the update to AVG Anti Spyware I noticed that my system was slower browsing with Firefox. I have 3 PC's running with NOD32 and AVG Antispyware 7.5, and 2 PC's suffer from the high CPU load. Those 2 PC's are the slowest of the 3, running with Celeron1400 CPU's combined with 512MB and 1GB of RAM. My Laptop is an Intel Core Duo T2300 with 1GB of RAM and this machine doesn't suffer from the high CPU load. Update: Switching back to Firefox 22.214.171.124 results in NO CPU load (it remains 0 !!!) when switching tabs !!! So AVG Anti Spyware 126.96.36.199 works OK with Firefox 188.8.131.52 But what is the problem with AVG Anti Spyware 184.108.40.206 combined with Firefox 220.127.116.11 ??!!