The slowness problem is 100% reproducible for me. I tested more than 20 times with various configuration(number_of_shards, memory, cpu, codec, eager_global_oridinals etc) and the result are almost same. I got small improvements but still takes more than 20 secs to load a single page.
I've also opened an SLOWNESS ISSUE 20 days ago, and still waiting for an answer.
I cannot understand why nobody on this forum ask about it?