That's exactly when it lagged for me too! I'm glad you're aware of it. I'd love to play it more, though. Do you have a Windows version of it?
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No unfortunately I don't :( and I don't know if we're allowed to edit submission for different versions. By the way, I haven't heard anyone else comment about it, but did you experience audio issues? Sometimes, usually when there was lots of shooting happening, the audio would kinda glitch in web for me but I also haven't heard anything about that from anyone. I converted all the wav files to ogg but it was still kinda there and its annoying not being able to tell if its a my laptop issue or everyone.
I haven't noticed any audio issues on my end while playing your game, but I've noticed it in mine. I'm also using the Godot engine. It's fine in the Windows version but the Web version is very oof.
If you check out my rating page for my game, there's a comment by FeralBytes on how to address this. I haven't had the time to try it myself yet, but it might help you!