It's actually the opposite. MPAs are pure overhead. In theory SPAs are faster because they only require a minimum of 1 user blocking network request, while MPAs need at least 1 for each page. Everything else is up to the implementation. So if you are doing heavy performance optimizations, SPAs will always end up faster. However that's not the full picture, and in practice there is a lot of nuance, but SPAs definitely have a higher performance ceiling.
Network latency is your no.1 bottleneck for every modern device, everything else is a distant second. Also you can optimize everything, but you can't make MPAs navigate without a network roundtrip.
