PeriodicTasks - how to make period smaller then 1 sec

I use skb to show the flag of language used. I use FvwmScript and minimal value of PeriodicTascs is 1 sec: (RemainderOfDiv (GetTime) 1)==0. But it is too large for a keyboard layout shown. Is it possible to make 0.2 sec in PeriodicTascs?

I see that this is an insoluble problem. I found the solution by using conky instead of FvwmScript. The time of switching of flags is two times better.