I used a Netbook Acer Aspire One with 1GB RAM, 768MB of zram setting.
I stressed the system by opening a dozen pictures and move large files from one hard disk to another, while surfing the internet watching videos on Youtube.

Well I have not noticed any significant performance increase.

Perhaps it is wiser to let the system use the full 1GB of Ram automatically, and perhaps this is not the appropriate test.
I do not know ...