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In general, I don't see much of a difference. When you open files affected by the plugins, however, you're relying on plugin code, so things can change.

For example, I have an XML file that is 15 MB. Before I installed these plugins, Quicklook would take about a second to show it as a simple text file, basically. Now it takes much longer (about 10 seconds) but the output is nicely formatted (well, "nicely": it seems to fail pretty quickly on one CDATA node, so most of the document is not formatted correctly... but I digress). Clearly QLColorCode is adding a big overhead when invoked.

I'm going to try it out but you should definitely be on the lookout over the next few hours/days/whatever. I had to go thermonuclear on a Textmate QL plugin that was causing all kinds of trouble without being immediately obvious about what it was. That being said I'm looking forward to using all of these.

I just installed them, doesn't seem to impact the speed of Quick Look.