I had to jump off my Core2Duo machine because oh Lordy the lag. My poor old eMachine was struggling. Best time was 40-something seconds.
Did it on my Dell i5 Desktop in 23 seconds. :/ So some older machines might have a tough time. Not all, but some.
What also helped was this:
-Set to default site theme. The new animated one adds to the lag.
-Shrink the game to 33%.
-Minimize the window and have the map open next to it for reference, that way you know where to go!
-Adblock helps (I'm sure everybody uses one here). Those pesky animated ads slow things down or freeze up the game.
-If you're having trouble on a certain browser, try switching. Firefox, Google Chrome, Safari, Opera.... They're all free to download. But I would recommend Firefox or Chrome.
-If too many blocks with the scarabs are in your way you might have to start over. Those blocks change location every time and bumping one costs a couple seconds.