I think what was consuming cpu and memory was the screen printing all that stuff.

Maybe this information will be useful

Memory used: 4.654296875 MB - Freed by GC: 9.162109375MB
State [mypool]
    Current Cache Max: 500 - min/max: 1/500
    Current Cache Size: 0
    Concurrent DL Requests: 25 - min/max: 1/50
    DL Request Interval (ms): 0 - min/max: 0/100
    Current Ask Rate (works/req): 10
    Consecutive Connect Fails: 0
    Consecutive Http Fails: 0
    Consecutive Http Auth Fails: 0
    Consecutive Http Busy Fails: 0
    Cache Excess: ?
    Cache Excess Trend: ?
    Cache Retreival Age: 0
    Incoming Rate: