I've got a Dell Chromebook 11, 2014 version. Intel Core i3 4005U, 4GB Ram. Runs roll20 beautifully (except for the smaller screensize making map space smaller, but I'm fine with that). Looking at the stats of a Lenovo 100s chromebook, with the Intel Celeron N2840 and 4GB of RAM, you should be fine - the specs aren't that much different from mine: <a href="http://zipso.net/chromebook-specs-comparison-table" rel="nofollow">http://zipso.net/chromebook-specs-comparison-table</a>... Also, Chromebook users unite!