This website will run some Javascript codes and benchmark how fast is your machine
I had run this on my MacBook Pro 2020 I got a score of 858.19
My machine specs:
MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports) Processor 2 GHz Quad-Core Intel Core i5 Memory 16 GB 3733 MHz LPDDR4X Graphics Intel Iris Plus Graphics 1536 MB Storage 1TB SSD