Why is our app size increasing drastically with little change of function?
<p>We have an app currently in the App Store, and its size is as follows according to iTunes connect:</p>

<p>iPhone 6: Download size 21.8MB, install size 28.5MB</p>

<p>Now this is not too bad. But with a newer version we have uploaded to iTunes connect, the sizes are like this:</p>

<p>iPhone 6: Download size 35.5MB, install size 73.1MB</p>

<p>And the original package compressed size is 114MB.</p>

<p>Now this is too large, even unacceptable. I have checked the .app file within the archive(which is 178MB), and surprisingly discovered that my code alone takes 55MB(which in debug mode is only 11MB), and swift standard libraries around 40MB.</p>

<p>The function of code of this version does not differ much with the previous: we added iPad support, added a few images(the asset is 7.8MB on both debug and release archive, which is not a problem), and updated our project to swift 3.</p>

<p>All the release sizes above are with whole module optimization turned on. Might there ba a configuration in my build settings that may leads to this huge size? If not, what else could I do to reduce the app's size as much as possible?(especially the 50MB codes)</p>

<p>Besides, WHAT is the cause of this? Is it swift 3 since we didn't change our code much?</p>