As some people probably noticed tonight. 021/022 were underperforming (reports of 500 pings). Upon investigation it seems there is a hardware problem causing the CPU to overheat and thus the server is dropping its clock speed. At the lower speed, it cannot maintain 1 full server, let alone 2.

Players for 021 (de_dust) should use server 074 (213.232.110.17:27045)
Players for 022 (de_dust2) should use server 302 (213.232.110.40:27025)

This will be the case for the forseeable future. Both of these servers are the same configuration as those on 021/022, but will most likely not suffer the lag problems often seen on 021/022 during peak times. So it might well be worth keeping these servers in your favourites permenantly.