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I've been teaching myself CGI and DBI programming with Perl, and I have questions about speed. I know some of these are very general, and that often the only answer is to benchmark using live code and data on the production server (or a facsimile thereof), but perhaps some of them are a priori obvious.
  1. Database access: I'd guess that connecting to and querying a database is far slower than any Perl-only operation. Correct?
  2. Modules: It would seem to me that every module loaded will slow the program a little due to disk reads: is this true? If so, is the speed hit worth the extra cleanliness you can get from user-created modules?
  3. Modules & Apache: Or does Apache cache modules to increase speed? If so, it still wouldn't cache user-created modules, right?
  4. OO: Object-oriented code, other things being equal, is slower than non-OO code, correct? (Realizing that sometimes OO can allow you to produce a more elegant and faster solution).
  5. SSI: Is there an appreciable speed difference between (a) using static HTML with SSI to 'exec' scripts and (b) generating the page 100% in Perl? I'd guess that one Perl script is faster that an HTML page with >$X 'includes' or 'execs'. But what's $X? Is "it depends" the only real answer?
TIA

In reply to Perl CGI and SSI speed by legLess

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