This is the best tl;dr I could make, reduced by 84.21%

The Lighthouse-testnet is already running successfully with 100,000 validators. [...] According to developer Danny Ryan, Ethereum 2.0 has already been successfully tested with 100,000 validators. [...] As Ryan explains, the Lighthouse test network is already running smoothly with 100,000 validators: One goal of any modern lighthouse test network is to ensure that thousands of validators can run smoothly on a small VPS with 2 CPUs and 8 GB RAM. In the first tests with 100k validators, clients consistently used 8GB of RAM, but after a few days of optimization, Paul was able to reduce this figure to 2.5GB with some ideas to reduce it even further soon.

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