You might want to change the swappines. On my Aquarius M10 it is set to 100% by default. If you want to know what swappiness is and why it can make things slower read this: https://en.wikipedia.org/wiki/Swappiness.
To change swappiness you must install the terminal app from the software center, then enter the folowing commands.
sudo su
mount -o remount,rw /
bash -c "echo 'vm.swappiness = 30' >> /etc/sysctl.conf"
cat /proc/sys/vm/swappiness
Restart your device. (yay)
If the last command doesn't return 30 then try this:
nano /etc/sysctl.conf
Once you enter this command you will enter a text editor. You will see 10 black dots on an orange box in the shape of a key pad. Tap and hold that box and a menu should pop up, select the option that says "SCR". You will see some arrow keys above your keyboard, use them to navigate the text file look for a line that says: vm.swappiness = some number
if you don't find it just add it. Replace some number
with 30
. Now you want to save the file by taping and holding the orange dots from before, and selecting "nano". you will see some options appear above your keyboard. Tap "ctrl+o" then "ctrl+x". Restart your device.