optimal hardware requirements & editing templates with H

Hello! I installed trial version of your creation
On my pc (Pentium 4, 1700MHz/1.69HHz, 1GB Memory, pretty enough of free HD space) MyEclipse works crucially slow to use it for work.
Where can i find actual hardware requirements? I mean which upgrade will allow applications like HTML Designer and Image Editor work really fast, as expensive famous application do with this and lower resources?
And also, can you please help: i ‘m trying to test HTML Designer in templates edition task, so i need it to open and keep non corrupted files of mixed html / template-engines’ syntax, like expensive things like Dreamweaver allow to do. I added “tpl” to extensions in the HTML Design preferences, but it still opens my .tpl files in simple notepad, even while i open them from HTML Designer.

Thanks in advance for responce/advices!!!!!!! 🙂