update README with new timings

Author: jcupitt

README.md

@@ -17,14 +17,15 @@ load, save, resample and filter.
 The vips website has this same test performed in many different image
 processing systems, with some discussion:
 
-https://github.com/jcupitt/libvips/wiki/Speed-and-memory-use
+https://github.com/libvips/libvips/wiki/Speed-and-memory-use
 
 ### Results
 
-Run on 21/9/16 with vips8.4, libgd2.1.1, imagemagick6.8.9 on a laptop.
+Run on 17/8/23 with libvips 8.14, libgd 2.3.3, imagick 3.7 on Ubuntu 23.04
+with a 3955WX.
 
 ```
-$ ./runner 
+$ VIPS_CONCURRENCY=4 ./runner 
 building test image ...
 tile=10
 test image is 5000 by 5000 pixels
@@ -37,55 +38,15 @@ measuring memuse for ./imagick.php ... done
 measuring memuse for ./gd.php ... done
 
 real time in seconds, fastest of three runs
-benchmark   jpeg
-vips.php    0.53    
-imagick.php 1.96    
-gd.php      6.86    
+benchmark	jpeg
+vips.php	0.28	
+imagick.php	1.58	
+gd.php	1.68	
 
 peak memory use in KB
-benchmark   peak RSS
-vips.php    67024
-gd.php      305620
-imagick.php 519860
+benchmark	peak RSS
+vips.php	80384
+gd.php	220928
+imagick.php	521128
 ```
 
-The convolution in gd is rather slow. If you comment that part out of the three
-tests, the differences come down a lot:
-
-```
-real time in seconds, fastest of three runs
-benchmark   jpeg
-vips.php    0.41    
-imagick.php 1.20    
-gd.php      1.85    
-```
-
-### Preparation
-
-You need the libvips library, plus all the development files. You can probably
-install via your package manager on linux or macOS. For Windows, you can
-download a pre-compiled binary from the vips website:
-
-https://github.com/jcupitt/libvips/releases
-
-You can also compile libvips from source:
-
-https://github.com/jcupitt/libvips
-
-You need to install the `vips` extension for PHP:
-
-```
-$ pecl install vips
-```
-
-`gd` is probably built into your php already. `imagick` is easy to install:
-
-```
-$ pecl install imagick
-```
-
-You need to pull in the php packages that this benchmark needs.
-
-```
-$ php ~/packages/php/composer.phar install
-```