After moving to Appium v1.3.1 tests duration increased

Earlier we were using Xcode 5, iPhone 5, iOS 7.1 and Appium 0.15-018, the duration of running tests was about 1,5 hours, now we moved to Appium 1.3.1, XCode 6.1, iPhone 5s, iOS 7.1 and the duration increased to 4 hours.
We suspect that this happens because searching elements with help of locators takes too much time, or is there another reason?