I was thinking about changing the display font in my terminals, just because I could. When I investigated the options, it seemed that most of the fonts I liked better than Monaco (the default) weren't even readable, let alone good-looking, unless they were antialiased. Wondering how much extra rendering that entailed, I set up terminals to display eight different fonts, each with a plain and an antialiased version. I then dumped my entire filesystem through each terminal with the command

time ls -R /

and recorded the processor time it used.

fontrealusersys
Apple Chancery7m2.662s10.690s49.330s
antialiased7m32.994s10.220s48.930s
Comic Sans7m6.869s10.630s50.030
antialiased7m8.787s10.220s48.250s
Copperplate7m2.576s11.080s50.580s
antialiased7m12.115s9.840s47.380s
Helvetica7m1.832s10.350s49.550s
antialiased7m0.930s10.120s49.080s
Marker Felt7m6.177s10.780s49.720s
antialiased7m34.381s10.050s47.530s
Mojo7m7.125s10.900s50.040s
antialiased7m25.478s9.910s48.120s
Monaco6m45.975s10.070s48.090s
antialiased7m4.967s10.220s47.480s
Zapfino7m43.748s10.200s48.580s
antialiased8m24.253s10.080s47.320s