iMac/gmail/photo problems - on a go slow...

[Karen]

Having problems whenever I have photos open, or sometimes it's certain websites or even facebook pages, the Mac goes slow and I get a pop up saying something about a script on gmail etc is making Safari unresponsive.

Any ideas?

 

[Tom]

cleared your safari cache?

 

[Karen]

cleared your safari cache?

Yep, anything else I can try??