As I've mentioned in the another topic - the performance issues is gone, and it seems to work pretty good now. One thing though that I'd like to report is autoformatting, when the code is being formatted and replaced (e.g. all component names are converted to the string letters: 

apex:pageBlockTable

 becomes 

apex:pageblocktable

and so on) - I'm not sure if it's a new or existing functionality, but it's very annoying and I don't understand why TWS  does this.