some profiling results:

Flat profile:

Each sample counts as 0.01 seconds.
  % cumulative self self total
 time seconds seconds calls ms/call ms/call name
  3.37 0.32 0.32 33228 0.01 0.01 headersEnd
  3.16 0.62 0.30 memPoolGet
  2.53 0.86 0.24 199695 0.00 0.00 httpHeaderIdByName
  2.11 1.06 0.20 xprof_stop
  1.48 1.20 0.14 xprof_start
  1.37 1.33 0.13 2692928 0.00 0.00 httpHeaderGetEntry
  1.16 1.44 0.11 351261 0.00 0.00
statHistBin(_StatHist const*, double)
  1.11 1.54 0.10 519896 0.00 0.00
cbdataInternalAlloc
  1.05 1.65 0.10 memPoolFree

read into this what you will :}.

What I get from it, is that the greatest single improvement we can get
is only 3%. However, the interesting ration is the self calls / % -
which is very high for headersEnd.

Rob

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