Compare timings of trapdoor activations to see how fast your redstone circuits run on client-side.
Sends client a message when more than one iron trapdoor is activated or deactivated at the same time. This mod is client-side and can be used on online servers with no other dependencies.
Put an iron trapdoor on output of the circuit and another trapdoor connected to your input, then try to synchronize the trapdoors using repeater and read how many ticks it takes for your circuit to run. In the demonstration, circuit runs in 2 redstone ticks.
You are going to need Fabric Loader 0.14.10 or newer installed in your game. More detail on installing Fabric on here. Then install the release you want to use and put it on your .minecraft/mods
folder.