When I investigate lag spikes on my tf2 srcds server I find out that it only happens when STV is enabled. Deeper investigations shows me that monitoring of STW port in HLSW was the source of lag spikes. To check if I was right I wrote small python script. And I found that A2S_PLAYER and A2S_RULES requests to SourceTV port causes lag spike on srcds server.

Script, wich I used to reproduse this issue:
import time
import SourceLib  # https://github.com/frostschutz/SourceLib
query = SourceLib.SourceQuery.SourceQuery('1.2.3.4', 27026)
while True:
    query.player()  # or query.rules()
    time.sleep(1.0)

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Best regards

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