As for loading time, yes, Pages will launch faster than NeoOffice. However...
...if your main goal is to have better compatibility with your Word-using friends, the solution is not to buy iWork. Pages has its own issues with Word documents (footnotes and tables come to mind), not to mention that you can't directly save as a Word file, you can only export to .doc. Furthermore, you can only read .docx files, not export. It's a solution that works but is quite cumbersome, at least compared to just setting NeoOffice to default save to .doc.
If you're concerned about speed, sure, go with Pages. Go with TextEdit, too; sometimes it loads .docx files better than Pages. If you're concerned about formatting, might I suggest just getting Word? Yes, it's slow, but I hear that Word 2011 is much faster than previous Mac versions.
india349