This was a good first stab at trying to improve startup performance, but its benefits weren't as good as they could be as your final application would normally have added a lot more method calls during startup, which wouldn't be natively compiled. This is essentially a predecessor to the custom profiles and it only precompiled the most expensive methods of a blank Xamarin Forms application. Some of you may have heard of a feature called Startup Tracing (Without the custom profile) that was introduced to Xamarin a few years back. Startup Tracing with Custom Profileīefore we go any further, I would just like to clarify some potential confusion. This gives us the best of both worlds by giving us the benefit of having a faster application startup, while only slightly increasing the APK file size. This natively compiles just the code that is used during application startup, while leaving the rest of the code to be compiled Just-In-Time (JIT). The other option, which will be discussed in detail here, is to use a startup tracing with a custom profile. So where does this leave Xamarin developers? Basically, there are two options, we can either use Mono to convert all our code to AOT compiled files, but as we saw earlier, this will significantly increase the size of an our APK. Xamarin applications cant hook into the process above as there is an additional requirement of first needing C# code to be interpreted through Mono. What it does is during the installation of the APK, it calls a utility called dex2oat (Dalvik Executable to Of Ahead Time) to convert the bytecode native machine code.īut why go through this whole process? Why not just bundle the AOT files like iOS does? The answer is simple, AOT complied files tend to be much larger and therefore increase the download size of the APK. Now ART has a nifty trick to improve application performance and memory usage through the use of AOT (Ahead-of time) compilation. dex files are then executed by the Android Runtime (ART). dex files ( Dalvik EXecutable), which are essentially a compact form of bytecode. If you have ever opened up an Android APK file, you would have seen some. But why is this and how do we improve the startup performance of our Xamarin Forms Android application? To understand this, let's take a step back and understand how Android works under the hood. In saying all of this, you may have seen that your Xamarin Android application isn't so snappy and tends to load a lot slower than their native counterparts. This has resulted in users expecting applications to startup quickly. In the modern world of mobile applications, there has been a strong push over the last years to make applications launch as quick as possible.
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