based on faster belts like https://mods.factorio.com/mod/UltimateBelts
there are no ability for me to use the one called "Extreme fast Belt" or higher.

i would also wish to know if it is possible to set an interconnection buffer, like one chest each inside and outside, then configure the i/o direction, the items will go the chest inside/outside based on input/output. every tick will send the items, etc. which is similar to a loader.

Yes, that exists in the mod (research "chest connections" if you haven't yet) and it's preferable to use chest connections with loaders instead of belt connections.

got you man, now it works with faster loaders.