Keep in mind micro benchmarks are useless. The lesson you should learn about these benchmarks is, that a Symfony "Hello World" benchmark results can really depend on the featureset you activate in Symfony.
Just run:
sudo apt-get install git docker python-pip && sudo pip install fig
git clone https://github.com/timglabisch/symfony_performance
sudo fig build
sudo fig run --rm symfonyp composer install --prefer-source --no-interaction
sudo fig run --rm symfonyp composer dump-autoload --optimize
sudo fig run --rm symfonyp app/console generate:bundle
sudo chmod -R 777 symfony/code/app/cache
sudo chmod -R 777 symfony/code/app/logs
sudo fig up
## Standard Symfony
curl http://127.0.0.1:8080/standard.php
ab -n 5000 -c 20 http://127.0.0.1:8080/standard.php
## Standard Symfony without Twig
curl http://127.0.0.1:8080/standard.php/twigless
ab -n 5000 -c 20 http://127.0.0.1:8080/standard.php/twigless
## Optimized
curl http://127.0.0.1:8080/optimized.php
ab -n 5000 -c 20 http://127.0.0.1:8080/optimized.php
## Optimized
curl http://127.0.0.1:8080/optimized.php/twigless
ab -n 5000 -c 20 http://127.0.0.1:8080/optimized.php/twigless
## Optimized (just FrameworkBundle + Benchmark Bundle)
curl http://127.0.0.1:8080/justFramework.php/twigless
ab -n 5000 -c 20 http://127.0.0.1:8080/justFramework.php/twigless
Running on my System (AMD Phenom(tm) II X4 955 Processor, MemTotal: 16433348 kB) using Docker + Fig.
symfony_performance git:(master) ✗ ab -n 5000 -c 20 http://127.0.0.1:8080/standard.php
Requests per second: 328.84 [#/sec] (mean)
Time per request: 60.821 [ms] (mean)
Time per request: 3.041 [ms] (mean, across all concurrent requests)
Transfer rate: 83.49 [Kbytes/sec] received
ab -n 5000 -c 20 http://127.0.0.1:8080/standard.php/twigless
Requests per second: 430.38 [#/sec] (mean)
Time per request: 46.470 [ms] (mean)
Time per request: 2.324 [ms] (mean, across all concurrent requests)
Transfer rate: 108.44 [Kbytes/sec] received
ab -n 5000 -c 20 http://127.0.0.1:8080/optimized.php
Requests per second: 506.07 [#/sec] (mean)
Time per request: 39.520 [ms] (mean)
Time per request: 1.976 [ms] (mean, across all concurrent requests)
Transfer rate: 128.49 [Kbytes/sec] received
ab -n 5000 -c 20 http://127.0.0.1:8080/optimized.php/twigless
Requests per second: 658.89 [#/sec] (mean)
Time per request: 30.354 [ms] (mean)
Time per request: 1.518 [ms] (mean, across all concurrent requests)
Transfer rate: 166.01 [Kbytes/sec] received
ab -n 5000 -c 20 http://127.0.0.1:8080/justFramework.php/twigless
Requests per second: 716.09 [#/sec] (mean)
Time per request: 27.930 [ms] (mean)
Time per request: 1.396 [ms] (mean, across all concurrent requests)
Transfer rate: 180.42 [Kbytes/sec] received