Aditional reverse was changing order of snapshots and the rest of code expected latest snapshots last.
Simplified ratio calculation.
Remove fake 0.001s for zero timed measurements. Snapshot of zero duration should not contribute to ratio calculation.

exploring order of samples and the lack of guarantee of their ordering

Original with extra debug

-Ensure time ordering.
-Remove fake time weight for samples from same time.
-Remove unnecesary reversing of snapshot.
Add test for memory and cpu snapshot ordering.