遅速 is read as ちそく (chisoku) and means speed.
ちそく
chisoku
こうちせっそく
better being rough and ready than slow and elaborate
こうちはせっそくにしかず
it's better to be rough and ready than slow and elaborate
おくれ
delay
おそい
dull
ちこく
lateness
おくれる
to be slow (of a clock or watch)
ちはい
delay (in payment, delivery, rationing, etc.)
おくらす
to delay
ちち
slow
おくらせる
ちはつちゅうせいし
delayed neutron
おそばまい
rice from a late harvest