Hello @cheonmu
Thank you for reaching out and I am happy to help!
I would reccomend you to use the Setup guide in the plugin – Performance>Setup Guide, and there, you will see the performance increase when testing different modules. If DB caching offers better results with caching, you should go with that, and if OC caching is offering better results, then this is the way to go.
This all depends on the website, trafic etc.
Object Cache allows to get data from the database more efficiently. Its purpose is similar to what Database Cache does. But compared to Database Cache, Object cache is more efficient as it allows to process fewer requests.
As a rule of thumb, Object Cache is not worth using on shared hosting for the same reason as Database Cache, i.e. database is often not the performance bottleneck, but disk input-output operations.
Thanks!
@vmarko, Thank you for your kind response!