ScriptableAutoSplit: Setting `refreshRate` leads to slower-than-expected update rates

[Gyoshi]

Setting refreshRate in the .asl does not lead to an actual refresh rate of the desired value, significantly at rates around 20-30 and 40-60 Hz. This is illustrated in the following graph

Notably, the jumps around 33 and 66 Hz correspond to decreases in the time intervals of approx 16 ms (~60 Hz). The measurements were produced by the following .asl:

state("LiveSplit") {}

startup
{
    refreshRate = 34;
    
    // Timer duration [s] * rate
    vars.iterations = 2*refreshRate;
    vars.i = 0;
}

update
{
    if (vars.i == 0)
        {
            current.timeUpdates = Stopwatch.StartNew();
            current.timeUpdates.Reset();
            current.timeUpdates.Start();
        }
    
    if (vars.i>=vars.iterations) 
    {
        vars.i = 0;
        current.timeUpdates.Stop();
        float elapsed = (float)current.timeUpdates.ElapsedMilliseconds;
        print("__Average refresh rate__ : " + vars.iterations*1000/elapsed);
    }
     
    vars.i++;
}

Note about the .asl: It's a bit weird that each instance prints the same value each nth update, but the value can vary when you reload the script.