Parameters t-reordering, t-PollRetransmit, PollPdu, PollByte

Hello Experts.
What will be the effect on DL user throughput if we increase/decrease t-reordering, t-PollRetransmit, PollPdu, PollByte?

Good radio conditions will benefit.
Bad radio conditions will get more harm.
Increase polltimer will do that for you.