speed center, which a twisted and pipe. I used to monitor their performance overtime, like what the performance of each revision of the code is. There's no sort of leader in that field that will just tell you, like, hay, your perform regressed by ten % on this commit. And so most of the things that i do are trying to approximate that. Part of that is making sure yo of metric in production that are telling you, so that you notice when things are slow. It's very easy to miss if your 90 fifth per centile is falling off a cliff rightlyor i have to, you have to be looking at your quartiles and all these different things not just