thanks for your reply. The reason I want to try another ROM is because I used a Xperia 1 II (docomo, 1 SIM) before which I disabled the "suspend execution for cached app" in developer option in order to prevent browser from being auto-reloaded. However, that setting has no effect for my current Xperia 5 III (dual SIM, XQ-BQ52). They both have 8GB RAM, 128GB ROM, running on A12 but different Build number. So, I guess there are some differences in ROM setting by manufacturer.
Are you aware of this issue and any suggestion for me? I rooted my X5III by magisk and using many apps like Root booster, Ram manager, 3C toolbox, Swapper... but no help at all
Thank you in advance