Yes, the Lenovo Z5 does have a Full HD+ display as it has a resolution of 1080 x 2246 pixels.
A Full HD resolution is of 1080x1920 and Full HD+ is a resolution greater than that.
Check Full Device Specifications Lenovo Z5
Nimesh Kumar Behera
To Increase the speed of your slow Lenovo Z5 here is the guide:
1. Clean all the app cache
4.Clear Data, Clear Cache
2. Disable the Animations
1.Go to "Settings"
2. Then Go to "About phone"
3.Tap on " Build Number" 7 times.
4. Then Go back to settings and Tap on " Developer Option"
5. Scroll Down to "Windows Animation Scale". as shown in the Image below
6. Tap on "Animation Off".
3. Close all your unused apps.
Closing all the apps which you are not using saves a lot of memory usages which can be utilized by other apps to make it run faster.
You can check the complete specs of this phone: Lenovo Z5