I have both Linode 512 and DigitalOcean 512 VPS. Both VPS are running the same version of Debian, same version of Apache (Apache/2.2.16 (Debian), same apache2.conf files, list of loaded modules are same. For benchmark is used same web site on localhost. (simple joomla site). Results are quite different and I can't figure why. Linode has much more "Requests per second".

   #linode London
  Server Software:        Apache/2.2.16
  Server Hostname:        localhost
  Server Port:            80

  Document Path:          /
  Document Length:        7483 bytes

  Concurrency Level:      20
  Time taken for tests:   33.140 seconds
  Complete requests:      1000
  Failed requests:        0
  Write errors:           0
  Total transferred:      8037000 bytes
  HTML transferred:       7483000 bytes
  Requests per second:    30.18 [#/sec] (mean)
  Time per request:       662.791 [ms] (mean)
  Time per request:       33.140 [ms] (mean, across all concurrent requests)
  Transfer rate:          236.84 [Kbytes/sec] received

  Connection Times (ms)
                min  mean[+/-sd] median   max
  Connect:        0    0   2.1      0      16
  Processing:   118  658 1143.2    487   19006
  Waiting:      113  655 1138.1    485   19006
  Total:        118  659 1143.2    488   19006

  Percentage of the requests served within a certain time (ms)
    50%    488
    66%    563
    75%    616
    80%    658
    90%    779
    95%    932
    98%   3635
    99%   6406
   100%  19006 (longest request)

    #DigitalOcean Amsterdam
  Server Software:        Apache/2.2.16
  Server Hostname:        localhost
  Server Port:            80

  Document Path:          /
  Document Length:        7483 bytes

  Concurrency Level:      20
  Time taken for tests:   118.087 seconds
  Complete requests:      1000
  Failed requests:        0
  Write errors:           0
  Total transferred:      8032000 bytes
  HTML transferred:       7483000 bytes
  Requests per second:    8.47 [#/sec] (mean)
  Time per request:       2361.734 [ms] (mean)
  Time per request:       118.087 [ms] (mean, across all   concurrent requests)
  Transfer rate:          66.42 [Kbytes/sec] received

  Connection Times (ms)
                min  mean[+/-sd] median   max
  Connect:        0    1   4.0      0      33
  Processing:  1256 2355 234.1   2284    3604
  Waiting:     1256 2328 232.5   2264    3604
  Total:       1256 2356 234.1   2284    3604

  Percentage of the requests served within a certain time (ms)
    50%   2284
    66%   2328
    75%   2412
    80%   2500
    90%   2666
    95%   2768
    98%   2877
    99%   3204
   100%   3604 (longest request)