Web rep extension excessive memory usage

[Dantu]

I installed Avast some weeks ago on 10.7.5
if the Web Rep extension is installed in Google Chrome
when I started up Chrome, memory went from 1.8gb to zero for a matter of minutes
then it would slowly return to 1.6gb

during that time almost everything on the computer is impossible to use (well, no memory, no wonder)

the solution is to un-install the Web Rep extension from Chrome.  Then on startup of Chrome memory went from 1.8gb to 1.6gb
end of problems

I recently (today) upgraded to Mountain Lion 10.8.3
performance is somewhat better, but still not good
if the Web Rep extension is installed in Google Chrome, when I start up Chrome
memory goes from 2.3gb to 10 mb
stays there for approx 30 seconds
and then returns to 2.1gb

again, the 'solution' is to uninstall the Web Rep extension from Google Chrome
end of problems.

Still can't register Avast (see post on this issue)

[Dantu]

Still have the same problem with a new installation of Avast (which cured my registration problem see other post)
The other problem (registration) may have been contributed to by improper uninstallation previously and I wanted to see if this  uninstall/install
using the Avast uninstall feature  (which corrected the registration issue) impacted on this issue
The new installation automatically enabled the Web Rep extension in Chrome.

If the Web Rep extension is installed in Google Chrome
then on starting Google Chrome, my Ram goes from 2.3GB to 10mb for a period of time (one to two minutes) and then slowly returns to 2.2GB
during this period nothing can be done on the computer (of course, no memory)
This occurs on every startup of Chrome (testing was done to see if it was just a startup issue)

If I uninstall the Web Rep in Chrome
when I start Chrome my memory goes for 2.3GB to 2.28GB  and there is no problem

Am on  iMac 12.2 (mid 2011) 3.4Ghz Intel Core i7 with 4GB of RAM running Mountain Lion 10.8.3

The solution as before is to disable the Web Rep extension in Google Chrome