Other member already mention other ways which useful for most cases. But if you need to check hundred addresses per minute with up-to-date data, your option is limited to either,
1. Use paid API.
2. Run self-hosted block explorer.
But data probably don't get updates in every block (like a block explorer). And looks like op is looking for a performance boost
The data is updated daily. But if you want to ensure data you use is only about 1 day behind, you need to download the data daily.
There are many sites that provide this service for free or paid. You can try this free site:
https://cointool.app/batchCheckBalance/btcIt gives good and fast results, and the other good thing about this site is that it gives aggregate address balance results for coins other than Bitcoin on many networks such as:
BTC, ETH, Arbitrum, BSC, Optimism, TRX, HECO, Solana, Polygon,.......etcI checked the website, but it doesn't offer API which probably required by OP.