How Systrace helped me to improve my code performance

I developed a complex feature for a project last month. You can imagine this feature as two separated modules. The first module does some heavy calculation. The second module shows the result of the first module in a ViewPager and multiple RecyclerViews. When I developed it for beta release, although I applied the best practices, I didn’t care so much about performance and my goal was to make it work without bugs. Yesterday I tried to improve my code. I was sure without any doubt that some parts of my calculation code can be optimized, e.g. I used multiple For…