I also do not understand the reason for the huge cache flow in EX_3 mode. One thing is certain: most of it is unusable cache, too old, too slow, or some other reason (in other words, fake)
An example:
If using caceheex more3 for one provider, for example 1702, which has approximately 150 sids, which should mean that the cache size 150 contains cwc to all 150 sids. Yes, but it actually is not. All we have seen even have a cache size 5000, it still you can not get 100% hits.
Another question is: why does cache to one provider with 150 sids, size reaches 5000, in theory, all duplicate (identical) cwc, should be deleted?