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I've found 1 block every few milliseconds on testnet on multiple addresses. It's multi threaded (via goroutines), you can trust the code
For the node, It is hosted on a 64Gb Memory, 1.19 Tb NVME and 1 Gibabyte connexion. I've never seen a bitcoin node with so much space available hahaha.
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Well, Kano's nodes (currently 7 of them spread around the globe) run more than that but still - certainly more than most folks run

About Testnet: Remember that it is running at a far lower difficulty so take the results you get with a grain of salt. For one thing with it running the much lower diff, Testnet does
not prove that your code works with the current diff - only monitoring the size of shares being returned from Mainnet can prove that. AFAIK if you get results over around 2/3 of current diff you should be good but others will have to chime in on the exact number.