回测时发生内存泄漏，怀疑是api的问题，请工程师帮忙看看

这段回测代码为啥出现严重的内存泄漏，感觉没问题啊，就剩下最简单的数据接收部分，还是泄漏

from tqsdk import TqApi, TqSim, TqAuth
from tqsdk import TqBacktest, BacktestFinished
from tqsdk.tafunc import time_to_str
import datetime
 start_date=datetime.datetime.strptime('2024-01-01',"%Y-%m-%d").date()
end_date=datetime.datetime.strptime('2025-08-31',"%Y-%m-%d").date()
 acc=TqSim(300000)
api=TqApi(acc, backtest=TqBacktest(start_dt=start_date, end_dt=end_date), auth=TqAuth("", ""))
 product='SHFE.ag'
quote=api.get_quote(f"KQ.m@{product}")
main_contract=quote.underlying_symbol
 ts=api.get_tick_serial(main_contract,data_length=5)
kd=api.get_kline_serial(main_contract, duration_seconds=5*60, data_length=300)
 try:
    while True:
        api.wait_update()
        if api.is_changing(quote, "underlying_symbol"):
            main_contract=quote.underlying_symbol
            ts=api.get_tick_serial(main_contract,data_length=5)
            kd=api.get_kline_serial(main_contract, duration_seconds=5*60, data_length=300)
            print(f"{product},{'沪金'},主力合约变换,数据准备完毕,数据量{len(kd)}")
        if api.is_changing(kd.iloc[-1],'datetime'):
            print(f"{time_to_str(kd.datetime.iloc[-1])} {main_contract} {'沪金'} {kd.close.iloc[-1]}")
 except BacktestFinished:
    print('回测结束')