![]() This operation takes around 8 seconds on my fairly good device, which has Android 5.1.1. There’s tons of Garbage Collections (GC) going on. You can see on the Android Studio Monitors how inefficient some String concatenation can be. Let’s say that you have a String, and for some reason you want to append more Strings to it 10 thousand times. Performance TipsĮnough theory, here is a list of some of the things you should consider if performance matters to you. Drawing is the slowest operation out there, so try redrawing only what you have to. ![]() For example, this includes the onDraw() function, which runs every frame, ideally 60 times per second. You will see the most benefit of optimizing code that runs often. You should also not waste too much time with micro optimization. So if possible, you should generally display some content as soon as possible and delay the background checks and updates a bit.Īlways remember, premature optimization is the root of all evil. According to another Nimbledroid post, out of the 100 top apps, 40 start in under 2 seconds, and 70 start in under 3 seconds. The first thing every user notices over and over is the app’s startup time. You might also get a lot of bad reviews on Google Play because of it. Only every third user will give you more time. If you’re loading some content, you have less than 11 seconds to show it to the user. ![]() According to a Nimbledroid post, 86% of users (including me) have uninstalled apps after using them only once due to poor performance. Let’s see some numbers first to consider how important optimization really is. Properly optimized and smooth apps greatly improve the user experience, and also drain less battery. ![]() Luckily, you don’t have to rely on your feelings or sense of smell, since there’s a lot of tools out there that can help you find bottlenecks by measuring and describing what’s going on. If you want to choose the most efficient method, you have to know what’s happening under the hood. As everything on Android can be done in a lot of different ways, picking the best option can be tough. Android devices have a lot of cores, so writing smooth apps is a simple task for anyone, right? Wrong. ![]()
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