When I add to my project the multidex:true, and make an Application class that extends from the MultiDexApplication, my project build time passed from 20 sec to around 90 se
Supplying as an answer because this is better fit with the formatting.
To simply answer your question: No, there is no way. Multidex is a process meant to help lift the burden of the 65k method limit. This process is complicated and will simply make your build times longer.
The best you can can do is lower your method count.
In your build.gradle (supplied here) you're using:
`compile 'com.google.android.gms:play-services:8.3.0'`
But if you look at the most recent play services api you can pick and choose what services you actually need.
Look at Table 1 on this page.
Only use the ones you need. Google play services as a whole is somewhere around 30k methods.
That should help.