The rate accepted shares has nothing to do with how "fast" its mining. Its simply the difficulty the pool has set the shares too. Higher diff, less accepted shares, which is what pools want since their servers would be overloaded if everyone mined low diff shares. Higher shares have more "value" so you mine more litecoin.
Most pools use vardiff, so accepted shares are averaged to around 1 share per minute, regardless of wether you mining with a Moonlander or an L3+.
yeah but some pools like zpool have the verdiff set so high it times out and then you are actually NOT mining..
You can set your own diff if they will accept it using D=. If not you probably need to be in another pool.