"Старушка" Java показывает как надо :D
url отдает JSP, по дороге выполняя sql запрос в postgresql
Core i5 540m 2.4Ghz (2c/4T)
Debian8 Java8 u45
Apache tomcat 8.0.15

export CATALINA_OPTS="$CATALINA_OPTS -server -noverify"
export CATALINA_OPTS="$CATALINA_OPTS -Xms768m -Xmx768m"

Postgresql 9.4 30 connections

This is ApacheBench, Version 2.3 <$Revision: 1604373 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient)


Server Software:        Apache-Coyote/1.1
Server Hostname:        localhost
Server Port:            9080

Document Path:          /das/login
Document Length:        4323 bytes

Concurrency Level:      30
Time taken for tests:   10.655 seconds
Complete requests:      30000
Failed requests:        0
Total transferred:      143160000 bytes
HTML transferred:       129690000 bytes
Requests per second:    2815.69 [#/sec] (mean)
Time per request:       10.655 [ms] (mean)
Time per request:       0.355 [ms] (mean, across all concurrent requests)
Transfer rate:          13121.56 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   0.7      0       6
Processing:     1   10   6.4      8      58
Waiting:        0    9   6.4      8      57
Total:          1   11   6.4      9      59
WARNING: The median and mean for the initial connection time are not within a normal deviation
        These results are probably not that reliable.

Percentage of the requests served within a certain time (ms)
  50%      9
  66%     12
  75%     15
  80%     16
  90%     19
  95%     22
  98%     25
  99%     29
 100%     59 (longest request)


Tomcat CPU load: 263%
JVM memory usage: ~500mb
Tomcat disk write(logs): 130Kb/s