chore(readme): add performance table

README.md

@@ -9,3 +9,19 @@ Supports:
 - various methods (date increment/decrement, random text, counter text, header)
 - multithreading
 - config file for saving common options
+
+## Performance
+
+Performance depends on hardware, method, and number of threads. The tests below
+were performed on Framework Laptop (A6) with an 11th Gen Intel® Core™ i7-1165G7
+@ 2.80GHz. Each method was tested attempting to generate the prefix `deadbeef`
+for 30 seconds using one thread.
+
+```
+  counter: 163,504,123 hashes (5,461,682.8102/s)
+   header: 124,617,875 hashes (4,150,993.226/s)
+   random: 110,886,440 hashes (3,715,452.2177/s)
+increment: 107,137,532 hashes (3,573,438.8338/s)
+  sequoia: 136,952 hashes (4,486.4209/s)
+gpg-agent: 353 hashes (11.7519/s)
+```