I have a Gigabyte T1028C with an Atom processor. No lag with 6 tables open, although I have heard 20-tabling is possible with HEM open.

I am going to test out 20-tabling with a remote connection to my desktop database as soon as I can download an installation file from HEM's website. Support, as usual, is really bad at providing support ...go figure. They are probably busy beautifying the GUI or buying a new piece of poker software.