diff --git a/README.md b/README.md
index 6b575027..177acd97 100644
--- a/README.md
+++ b/README.md
@@ -143,6 +143,43 @@ Oxipng is open-source software, distributed under the MIT license.
 
 ## Benchmarks
 
+Tested OxiPNG 9.0.0 (commit `c16519b38b0519988db625913be919d4f0e42f5d`, compiled
+on `rustc 1.74.0-nightly (7b4d9e155 2023-09-28)`) against OptiPNG version 0.7.7,
+as packaged by Debian unstable, on a Linux 6.5.0-2-amd64 kernel, Intel Core
+i7-12700 CPU (8 performance cores, 4 efficiency cores, 20 threads), DDR5-5200
+RAM in dual channel configuration.
+
+```
+
+Benchmark 1: ./target/release/oxipng -P ./tests/files/rgb_16_should_be_grayscale_8.png
+  Time (mean ± σ):      59.6 ms ±   7.7 ms    [User: 77.4 ms, System: 3.6 ms]
+  Range (min … max):    53.3 ms …  89.9 ms    32 runs
+
+Benchmark 2: optipng -simulate ./tests/files/rgb_16_should_be_grayscale_8.png
+  Time (mean ± σ):     132.4 ms ±   0.8 ms    [User: 132.5 ms, System: 0.6 ms]
+  Range (min … max):   131.8 ms … 134.4 ms    22 runs
+
+Summary
+  ./target/release/oxipng -P ./tests/files/rgb_16_should_be_grayscale_8.png ran
+    2.22 ± 0.29 times faster than optipng -simulate ./tests/files/rgb_16_should_be_grayscale_8.png
+
+Benchmark 1: ./target/release/oxipng -o4 -P ./tests/files/rgb_16_should_be_grayscale_8.png
+  Time (mean ± σ):      88.7 ms ±   4.3 ms    [User: 270.3 ms, System: 11.0 ms]
+  Range (min … max):    86.8 ms … 109.4 ms    26 runs
+
+Benchmark 2: optipng -o 4 -simulate ./tests/files/rgb_16_should_be_grayscale_8.png
+  Time (mean ± σ):     444.9 ms ±   0.3 ms    [User: 444.8 ms, System: 0.7 ms]
+  Range (min … max):   444.4 ms … 445.6 ms    10 runs
+
+Summary
+  ./target/release/oxipng -o4 -P ./tests/files/rgb_16_should_be_grayscale_8.png ran
+    5.01 ± 0.25 times faster than optipng -o 4 -simulate ./tests/files/rgb_16_should_be_grayscale_8.png
+
+```
+
+<details>
+<summary>Older benchmark</summary>
+
 Tested oxipng 5.0.0 (compiled on rustc 1.55.0-nightly (7a16cfcff 2021-07-11)) against OptiPNG version 0.7.7 on AMD Ryzen 7 4800H with Radeon Graphics with 16 logical cores
 
 ```
@@ -174,3 +211,4 @@ Summary
     5.16 ± 0.58 times faster than 'optipng -o 4 -simulate ./tests/files/rgb_16_should_be_grayscale_8.png'
 
 ```
+</details>