Safari problem on imac
On my imac safari becomes slow, information comes: this webpage needs high storage. Close page and speed of mac will improve.
Often the page Then gets dark.
I did reinstall Catalina, but safari did not improve. So at this point it is not usable.
On ipad, safari works fine.
How can I fix this problem
iMac 27″ 5K, macOS 10.15