docs: add benchmark results

docs/guide/benchmark.md

@@ -2,4 +2,22 @@
 
 Press the button below to run a simple benchmark.
 
-<Benchmark />
+<Benchmark />
+
+## Benchmark results
+
+| Tier      | Device             | Chrome | Safari |
+| --------- | ------------------ | ------ | ------ |
+| Low-end   | Samsung Galaxy A11 | 4.583s | -      |
+| Low-end   | iPhone SE (2020)   | -      | 1.282s |
+| Mid-range | Google Pixel 7     | 1.027s | -      |
+| Mid-range | iPad (9th gen)     | –      | 1.401s |
+| High-end  | Google Pixel 9     | 0.894s | –      |
+| High-end  | MacBook Air M3     | 0.312s | 0.423s |
+
+Tested with BrowserStack using the following configuration:
+
+- **Challenge difficulty:** 4
+- **Number of challenges:** 50
+- **Salt/challenge size:** 32
+- **Number of benchmarks:** 50