On 20-3-2010 23:38, Karl Berry wrote:

     LaTeX decided to enable all the patterns, it became noticably slower

Strange, I don't experience that at all.  (And can't see how loading
extra patterns could conceivably matter to normal document processing
time.  Unless you're talking about lualatex.)

for context:

more pattern result in slower generation of the format (in pdftex a bit slower as there the utf is to be interpreted); this might also lead to slower loading of the (then bigger) format (depends how well the OS cached files for succesive runs)

in mkiv patterns are loaded on demand; even loading all patterns in luatex is no big deal as it uses a different representation

Hans

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