We are having this annoying problem as well. Few seconds freezing when editing *anything*. In my case, it happens the most when I am editing properties files, of about 3900 lines. Never ever had a single issue with that in IDEA 7, only showed up after upgrading to 9.
Config is as follows:
Two identical machines, Intel quad core, 8GB ram, etc.
1 machine runs Linux 22.214.171.124-105.fc11.x86_64
1 machine runs WinVista x64
Both machines run IDEA with JDK1.6.0_17 x64
All systems patched to the max. Both suffer the same problem.
Memory is not the issue here, since we got plenty assigned. This is my (Linux) idea.vmoptions:
I've been paying attention to the memoryindicator in IDEA, and here's what happens: it freezes, adds 400m to the used memory, then continues. After a few seconds it freezes again, and adds another 400m. After another freeze, it drops back to 300m. And this will cycle for the rest of the day like this.
Please, please get this sorted asap. (Do I sound desperate?? Yes, that's because I am!) If you need me to get you some output of some kind, please say so, and you got it....