The equipment you have a very respectable!
You must have something messed up with the installation - insert here as you can your sys.txt, and describe where and what (what apk / version /) is installed.
We will help and will whisk. Probably (on my nose) forgot to increasing memory and you have FullHD - it is terribly slow.
HD screen and your resolution requires a lot of memory.

A very simple solution try this - probably the most important thing for Full HD and QHD screens are:
1. Record max_memory = ???? section [debug] in sys.txt, Which many very present.
In data.zip by default max_memory = 83886080 (Byte), Which is only 80 MB

Even prescribing 150 MB you can still watch the brake.
So write at least 200 MB (1mb = 1048576) and enjoy:

In the sys.txt write:

[debug]
max_memory = 209715200

2. and disable the animations in the settings screen.(Option in setup screen in iGO)

If 200MB is not enough - declare 300, or 400 - your problem is over!
PS Remember when you enter a value max_memory that 1MB = 1,048,576, so typing
300 * 1048576, or 400 *1048576 - as max_memory

If this does not help please what I wrote at the beginning (show sys.txt) - but I think that you will not need
regards wojpen