The rasterizer threshold is an integer specifying the number of frame intervals that the rasterizer must miss before it decides that the frame is suitable for capturing an SkPicture trace for further analysis.
Source
int get rasterizerThreshold => _rasterizerThreshold;
Source
set rasterizerThreshold (int threshold) {
assert(threshold != null);
if (threshold == _rasterizerThreshold)
return;
_rasterizerThreshold = threshold;
markNeedsPaint();
}