There are two situations that a timer does not handle correctly, as I see it.

1) The interval is set to 1 second. Its code takes only a fraction of a second to run. Another process takes 5 seconds. When the other process finishes, the timer fires 5 times in a row, all within the same second. This is an overkill of 4 firings.

2) The interval is set to 10 seconds. Its code can take less time, but there are situations that it will take more than 10 seconds, e.g. 30 seconds. After the process (let's say 30 seconds) the timer will fire again immediately. This too is overkill. It should indeed redo the process immediately, but not twice in a row.

Both situation require some dedicated programming. The first one can be tackled by having a property in which we store the time of this moment. It can be compared on the next call. Then we know how much time has elapsed. It the elapsed time is less than the interval, we may decide to skip the event.

* TIMER event
local lnS
lnS = seconds()
if ( m.lnS - thisform.nTimerSec ) < ( this.interval / 1000 ) - .05
    * do nothing
else
    * do whatever
endif
thisform.nTimerSec = m.lnS

The second one can in part be dealt with using the timer.Reset() method. However, in the case I sketched it would not lead to one immediate call. Instead it would lead to a call only after 10 seconds. A more elaborate piece of code is required here.

Any ideas?