After updating to 10.3 I could see a list of 32bit apps by tapping applications under settings->general, all I had on the phone was 5 games I never really play on the phone anymore. So after making sure these were all on the iPad I removed them from the phone and restarted it. Now I only have 64-bit apps installed and confirmed in settings->general as I can no longer tap on applications to see a list of 32-bit apps. Since doing this I've notified a performance boost the phone. Apps seem to stay open in the background properly. This makes sense because iOS does not need to keep many 32-bit libraries loaded in RAM ready so in theory more RAM is available. Has anyone else noticed this? Any tool can be used to determine the RAM available with and without 32-bit apps installed?