Quit safari, then, in the Terminal, enter the following command:
defaults write com.apple.Safari WebKitResourceTimedLayoutDelay 0.0001
Make sure you also implement the previous hint; for sake of convenience, the command in that hint was:
defaults write com.apple.Safari WebKitInitialTimedLayoutDelay 0.25
Warning: If you don't have a fast machine, you may want to increase the numbers, instead of 0.0001, try 0.05, 0.1, 0.25 or 0.5...
[robg adds: There was some discussion in the comments to the original hint regarding the exact format of the defaults write command and whether you needed the -float flag. The man page for defaults seems to state that you do not:
For the basic plist types (strings, data, ints, floats, booleans, and dates) it is not necessary to precede the value with a type qualifier. For example, the following commands are equivalent:So the commands in the hint should work just fine without the -float.]
defaults write somedomain preferenceKey 500
defaults write somedomain preferenceKey -int 500

