Is something that takes 1 second noticably faster than something take 1.1 seconds? Maybe it's too close to tell.
Here are two simple tests to measure the extent to which we notice differences in response times.
These take just a few seconds each. You can do each just once, but repeating each for about 5 minutes will be much more useful.
You will be asked to click buttons, wait for things to happen and say which of the two things was faster.