15-25% CPU usage

Could you please test whether the problem also occurs with the version in the snapshot?
https://launchpad.net/~onboard/+archive/snapshots

Yes, still needs 20% CPU plus some new issues

This might be onboard's click polling. Burli, does it stop when you click a couple of times anywhere outside of onboard? If so, does it start again when you just move the cursor over onboard?

Also what kind of cpu are you using? Is this an Atom by chance?

What are the new issues?

Hm, difficult to verify. But I think it could be the click polling. Sometimes the CPU usage gets back to 0%, especially if I click somwhere else

And yes, it's an Atom N450. I will check the other issues first and I will search for existing bug reports

Should be much better from revision 694. Now the timer stops completely after 30s too.

I uploaded revision 697 of trunk into the Snapshots PPA for the case you would like to test it.
https://launchpad.net/~onboard/+archive/snapshots/+packages

Yeah, looks good now. Well done. Now it's fun to use the tablet :)

Cool. Since you're using a tablet, could you check out screen rotation?
https://bugs.launchpad.net/onboard/+bug/911821
It should remember position and size of the keyboard and the floating icon separately on landscape and portrait screens. If you can, post in the above bug pls.

No, sorry. Screen rotation doesn't work until now in Unity