ab -c 1 -n 500 -C MY_USER1_SESSION_COOKIE http://mysql.drupalhead.local/

-------------------------------------------

Current HEAD

Requests per second:    3.81 [#/sec] (mean)
Time per request:       262.528 [ms] (mean)
Time per request:       262.528 [ms] (mean, across all concurrent requests)
Transfer rate:          67.57 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:   255  261  16.4    259     523
Waiting:      239  244  15.4    242     490
Total:        255  261  16.4    259     523

-------------------------------------------

placeholder-at.patch

Requests per second:    3.78 [#/sec] (mean)
Time per request:       264.589 [ms] (mean)
Time per request:       264.589 [ms] (mean, across all concurrent requests)
Transfer rate:          67.04 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:   256  264  23.9    260     529
Waiting:      240  246  23.1    243     508
Total:        256  264  23.9    260     529

-------------------------------------------

placeholder-at-is_array.patch

Requests per second:    3.80 [#/sec] (mean)
Time per request:       262.971 [ms] (mean)
Time per request:       262.971 [ms] (mean, across all concurrent requests)
Transfer rate:          67.45 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:   257  262   9.3    260     340
Waiting:      240  245   9.0    243     322
Total:        257  262   9.3    260     340

-------------------------------------------

placeholder-is_array.patch

Requests per second:    3.82 [#/sec] (mean)
Time per request:       261.708 [ms] (mean)
Time per request:       261.708 [ms] (mean, across all concurrent requests)
Transfer rate:          67.78 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:   256  261   7.0    260     348
Waiting:      239  244   6.7    243     330
Total:        256  261   7.0    260     348