Let me present to you my first published app in google play. it is both free and ad-free and requires no permissions.
Trimmer allows you to trim your device NAND chip manually, which may improve your device storage speed significantly.
it supports lollipop as well and I am going to add more features to this app in future so stay tuned
In order to use this app your device should be rooted and your device NAND chip should support TRIM command.
Let me know what you think and send me your suggestions for next update.
Here is a short explanation about what this app does :
Almost all Android devices use NAND chips for data storage. Because of how NAND chips work, they may become significantly slow after some time. Trimming would help to restore NAND Chips performance to their initial value. Although Android 4.3+ supports trim natively, users have no control over this process and Android doesnt trim the storage as much as it is supposed to do, which results in slow storage performance and thus laggy devies. Trimmer enables you to trim your device manually if you feel it has become laggy.
Trimmer incorporates a well-known fstrim utility which is a part of Linux kernel tools. This utility trims memory devices which support TRIM operation.
If you liked my app, please dont forget to rate it 5 stars. your stars will give me motivation to spend more time developing and add more features to this app.