The Proguard tool secure the app for production, including shrinking, code optimization and obfuscation. However, obfucated code will have a sligthly negative impact on power consumption. The good news is, Proguard has the setting -dontobfuscate that you could set in your proguard-rules.pro file. Using that you will get your code optimized but not obfuscated. Then, it could be set in your debug buildTypes > release section of your build.gradle.