I found this trick to be useful if opening many tabs for Win7 with 4 gig ram:
1. Open each tab to each site you want to view.
2. Open task manager and end the PM process.
3. Start PM again, which will give you an "error closing PM" message. Select "open all tabs"
4. View just one tab; it will operate at full speed, and will not load the other tabs until you click on them.
This lets you go through all the tabs one by one, only loading the one tab you want.
1. Open each tab to each site you want to view.
2. Open task manager and end the PM process.
3. Start PM again, which will give you an "error closing PM" message. Select "open all tabs"
4. View just one tab; it will operate at full speed, and will not load the other tabs until you click on them.
This lets you go through all the tabs one by one, only loading the one tab you want.