I second the Eclipse with EPIC plug-in! IMHO only better thing for Perl is ActiveStates Komodo which I would probably use if it had better support for XHTML, CSS and JavaScript (no fancy WYSIWYG - just code completion).
As of using a lot of "performance sometimes" - it's actually pretty good if you ask me. Until recently I was running it on a PIII 850 Mhz and 256 MB of RAM Compaq laptop dating back to '99 I think - admitted, I used Gentoo + XFCE for it. And it slowed down only after I started Opera, Apache and MySQL :D
While not the most scientific test ...
alex@msi ~ $ free -m
total used free shared buffers cached
Mem: 2018 685 1332 0 135 207
-/+ buffers/cache: 342 1675
Swap: 2175 0 2175
>>> Here I started Eclipse 3.4 with both Aptana (html/css...) and EPIC (perl) plug-ins active.
alex@msi ~ $ free -m
total used free shared buffers cached
Mem: 2018 910 1108 0 138 301
-/+ buffers/cache: 470 1547
Swap: 2175 0 2175
alex@msi ~ $
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