Does increasing cache size of memory translate to higher I/O speeds? Hello Android Enthusiasts!

I recently came across this app SD Booster on the Play Store that claims to increase I/O speeds. On installing it, it showed me that the default cache size for my device is 128KB and the optimal size is 512KB.

My question is, will increasing the cache size to 512KB actually increase I/O speeds? Also, can changing the system defaults cause any adverse effects?

Any help is appreciated.
I did some research on the topic and came up with the following chart. It seems that increasing the cache size does NOT always translate to higher I/O speeds.

Test Device: Samsung Galaxy S-III i9300, 1.7GHz, 1GB RAM, CM 11 Custom Modded

Test Operation: 100MB Archive Read, Paste 100MB file to SD Card, Launch Time: Stack Exchange

The chart displaying the results of the test is as follows.



As seen in the chart, all the three test parameters were on their best with the stock (default) cache size of 128KB. Higher sizes gave equally good performance in reading speeds, but failed to perform in write and launch operations.

Conclusion: The default cache size has been already optimised for maximum performance and need not be changed by the user for day-to-day functions.