Editing large document _extremely_ slow

[mika]

Using the latest UR trial version, I created a very small tree and into a text node I pasted a reasonably big but not huge document ~140kb

On my machine, a 4 years old 64bit dell laptop editing in this document is nearly impossible .. if i type at my normal speed which is not great I have to then stop and wait as the words slowly appear on the screen while the interface is locked. Totally painful. No other editor on my system is having any such issues and if this is normal performance then unfortunately UR is unusable for me.

Am I missing something ?

Thanks!