I've been roughly measuring the performance of pd's audio atoms by creating large arrays of them in a subpatch and monitoring overall CPU usage. I'll post the measurement patch if there's demand.

bob~ 168.00

vline~ 80.00

bonk~ 50.00

sigmund~ 43.00

line~ 21.50

pow~ 19.25

mtof~ 14.50

exp~ 10.50

vcf~ 8.25

log~ 7.00

framp~ 7.00

sqrt~ 5.50

q8_sqrt~ 5.50

rsqrt~ 5.25

q8_rsqrt~ 5.25

rfft~ 5.00

tabread4~ 5.00

osc~ 3.50

cos~ 3.50

bp~ 3.50

tabread~ 2.50

rpole~ 2.25

lop~ 2.22

phasor~ 2.00

tabosc4~ 2.00

/~ 1.67

ftom~ 1.63

rzero~ 1.25

abs~ 1.06

clip~ 1.00

threshold~ 1.00

vsnapshot~ 1.00

tabwrite~ 0.88

hip~ 0.72

+~ 0.61

*~ 0.61

-~ 0.61

snapshot~ 0.50