minor perf improvement in `abstract-pool`
minor perf improvement in `abstract-pool`

AyaMorisawa/kefir,AgentME/kefir,lautis/kefir,AyaMorisawa/kefir,elsehow/kefir,lautis/kefir,AgentME/kefir,pixelpicosean/kefir,hsavit1/kefir,pixelpicosean/kefir,elsehow/kefir,kelsadita/kefir,kelsadita/kefir,hsavit1/kefir