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Well, if converting a PSD takes so many resources and time, why doesn't the user convert it before uploading?

There are programs out there for this, like IrfanView, that is really small and with which you can read PSD files and save them as anything else. Have many PSD files? it supports batch convertion, no reason to not-to-convert before uploading. Hehe.

(or you could tell the user to upload both the psd file and a jpg/png of the psd, whatever is better than processing a single file for 15 minutes).

(and if we're taking my.imouto strictly as a local server, personally i save psd files in a different directory)...