You can find the CPU model for the ES nodes in https://elasticsearch-benchmarks.elastic.co/ i.e.
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model name: Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
Our results (way back in 2018) showed a drop no more than 8% in specific tracks like
For a methodological approach to troubleshooting performance issues, I suggest watching @danielmitterdorfer 's talk about The Seven Deadly Sins of Elasticsearch Benchmarking.