If you're interested in automating an install of SolrCloud (Solr plus ZooKeeper) in IaaS patterns, then
this script may be of help
to you. It was written a while back, to target Solr 7, but the patterns should be broadly applicable to newer versions too. It shows a pattern for installing Java, ZooKeeper and Solr in multi-node cloud-mode either all on one machine, or across multiple machines.
My "Measure, if you want to go faster!" talk
I've presented a few variations on this talk about how you can use standard Sitecore development tools to help find performance challenges in your code. I've got copies hosted here, in case you watched and want to go back over the material, or if you missed it and want to find out what I said...
The most recent version was at SUGCON 2019 in London. (Available to
watch on YouTube) That's the version I'd recommend if you've missed out on seeing it live. But there's info on two other versions here too, in case it's of use: It was originally
a brief talk at a Manchester (UK) user group, and it was expanded to be
a session at Symposium in 2018.