Draft: (hafbe 1) Fix proxy power API performance

Michal Zanderrequested to merge
mzander/fix-proxy-power-api into develop 
    -- old version: Execution Time: 2269.497 ms -- blocktrades
    -- old version: Execution Time: 7203.320 ms -- gtg
    -- old version: Execution Time: 711.519 ms  -- arcange (only 1 proxy account)

    -- new version: Execution Time: 75.345 ms -- blocktrades
    -- new version: Execution Time: 40.623 ms -- gtg
    -- new version: Execution Time: 30.473 ms -- arcange (only 1 proxy account)

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