Hi At some point I got a feeling that actual Delay time is longer than expected. It is especially visible on small delays less than 100ms (otherwise difference is < 1%). [image: Inline image 1] Documentation says that *Delay waits approximately* for specified amount of time. However, according to experimental data an actual difference is always positive with the value around 1.5-2 seconds. It is actually strange where such a constant difference, independent from delay length, comes from. [image: Inline image 2] To conclude, if you want to wait more precisely you need to create delays with duration 1.5 seconds less than expected. Also it would be interesting to test on different hardwares to make sure that difference stays constant (around 1.5-2s) I used the following script to gather data and save in .csv file http://ws.stfx.eu/DSCLG2ON0VBI Tested on: Pharo: #50636 Spur-VM: #463 OS: Mac OS Yosemite CPU: Intel Core i7 2.39 GHz Cheers, Alex
