Since the Super-Cache is generation a static file on the file system. I suggest there be an extra option that allows the users to simply compact the HTML file:
JUST Remove the spaces and tabs in HTML.
Because the gzip sometimes make IE works weird but a simple compact would make the file smaller without messing anything up. This may save some bandwidth for bloggers :)
Compacting HTML is actually a non-trivial problem. You can't just arbitrarily get rid of newlines and spaces and tabs and such, because some of them matter and some of them don't.
Removing spaces is a lot less efficient than gzipping and as Otto says, some spaces matter! The latest releases of the plugin may have fixed the problems with IE. Have you updated your wp-content/cache/.htaccess?
@Otto42 Yes, reasonable tip, thanks :)
@Donncha Thanks so much! Let me take a look about the .htaccess issue.
Thanks Donncha, I followed your tips and made it.
Now at the foot of my page, it shows:
<!-- Dynamic Page Served (once) in 0.187 seconds -->
<!-- Cached page served by WP-Super-Cache -->
<!-- Compression = gzip -->
So does that mean everything works fine for me? :)