Added memory and iMac got slower!!

Ok guys, along with the external HD (see other post) I bought a 512MB memory card for my iMac G4 800. It's a PC100 SODIMM card and the system profile recognizes it just fine.
Now, when I opened Photoshop, I noticed that regular tasks are now taking longer! Just to activate a layer, for example, you can see it struggling to draw the **** thing! I didn't noticed it before... Could it be the memory? Maybe I should have bought the PC133? My bus speed is 100MHz, that's why I bought the PC100.
Well, let me know your thoughts.
Cheers
JS

The iMac G4 800MHz needs PC133 RAM. PC100 is too slow for the memory bus. This article (link) explains. 
mrtotes

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