long lines and slowness (common when viewing style sheets)

Now that everyone likes to send their style sheets as one big long line,
like 250k long, viewing them in dillo is slow.

gprof says
  %   cumulative   self              self     total           
 time   seconds   seconds    calls   s/call   s/call  name    
 32.47      1.88     1.88 189407242     0.00     0.00  lout::misc::NotSoSimpleVector<dw::Textblock::Word>::getRef(int) const
 29.36      3.58     1.70 187437456     0.00     0.00  dw::Textblock::BadnessAndPenalty::lineCanBeBroken(int)
 28.15      5.21     1.63    29345     0.00     0.00  dw::Textblock::wrapWordInFlow(int, bool)

and I wonder whether any optimizations are possible.