You can't test keyboards on the internet yet so you know to get out and go shopping.

As to fast turn on, almost all the laptops today have 5 and less second turn on from sleep or zero power sleep so that issue is not much a challenge anymore.

As to the lot of browser tabs I'm sure you know that what's in the tabs matters. If I open a couple heavy script pages I can get about 4 tabs open here. Static content however seems to let me open a few hundred tabs. That's a strange request since it matters what's on the page.
Bob