Core i7 @2,4 GHz, Darwin 11.4.2
pi() := mpfr_const_pi(r, MPFR_RNDN)
sin(2) := mpfr_sin(r, 2, MPFR_RNDN)

6.0.0a patch 84965a50fd92 default configuration
2014-06-07 20:00:12.228 MpCalc[40458:2203] patch pi() @ 1000000 0.292500 secs
2014-06-07 20:00:26.519 MpCalc[40458:2203] patch pi() @ 1000000 0.289900 secs
2014-06-07 20:00:27.803 MpCalc[40458:820b] patch pi() @ 1000000 0.291300 secs
2014-06-07 20:00:29.032 MpCalc[40458:820b] patch pi() @ 1000000 0.292400 secs
2014-06-07 20:00:30.238 MpCalc[40458:820b] patch pi() @ 1000000 0.295700 secs
2014-06-07 20:00:31.531 MpCalc[40458:820b] patch pi() @ 1000000 0.291400 secs
2014-06-07 20:00:32.824 MpCalc[40458:820b] patch pi() @ 1000000 0.291800 secs
2014-06-07 20:00:34.035 MpCalc[40458:820b] patch pi() @ 1000000 0.291600 secs
2014-06-07 20:00:35.276 MpCalc[40458:820b] patch pi() @ 1000000 0.291800 secs
2014-06-07 20:00:36.495 MpCalc[40458:820b] patch pi() @ 1000000 0.293200 secs
avg. 0.29216
2014-06-07 20:00:48.794 MpCalc[40458:820b] patch pi() @ 5000000 2.168600 secs
2014-06-07 20:00:56.585 MpCalc[40458:820b] patch pi() @ 5000000 2.166700 secs
2014-06-07 20:01:00.883 MpCalc[40458:2203] patch pi() @ 5000000 2.171200 secs
2014-06-07 20:01:04.089 MpCalc[40458:7517] patch pi() @ 5000000 2.168800 secs
2014-06-07 20:01:07.111 MpCalc[40458:7517] patch pi() @ 5000000 2.170500 secs
2014-06-07 20:01:10.122 MpCalc[40458:7517] patch pi() @ 5000000 2.168300 secs
2014-06-07 20:01:13.147 MpCalc[40458:7517] patch pi() @ 5000000 2.170800 secs
2014-06-07 20:01:16.156 MpCalc[40458:7517] patch pi() @ 5000000 2.167300 secs
2014-06-07 20:01:19.125 MpCalc[40458:7517] patch pi() @ 5000000 2.171000 secs
2014-06-07 20:01:22.152 MpCalc[40458:1a0f] patch pi() @ 5000000 2.169400 secs
avg. 2.16926
2014-06-07 20:01:45.252 MpCalc[40458:1a0f] patch pi() @ 10000000 5.231300 secs
2014-06-07 20:01:51.545 MpCalc[40458:1a0f] patch pi() @ 10000000 5.199900 secs
2014-06-07 20:01:57.571 MpCalc[40458:761f] patch pi() @ 10000000 5.213900 secs
2014-06-07 20:02:03.693 MpCalc[40458:761f] patch pi() @ 10000000 5.219500 secs
2014-06-07 20:02:10.086 MpCalc[40458:711b] patch pi() @ 10000000 5.212700 secs
2014-06-07 20:02:16.207 MpCalc[40458:731f] patch pi() @ 10000000 5.209400 secs
2014-06-07 20:02:22.301 MpCalc[40458:7623] patch pi() @ 10000000 5.213400 secs
2014-06-07 20:02:28.437 MpCalc[40458:7623] patch pi() @ 10000000 5.201200 secs
2014-06-07 20:02:34.759 MpCalc[40458:7623] patch pi() @ 10000000 5.214000 secs
2014-06-07 20:02:40.990 MpCalc[40458:1b27] patch pi() @ 10000000 5.205500 secs
avg. 5.2120798
2014-06-07 19:50:02.673 MpCalc[40426:7b0b] patch sin(2) @ 1000000 1.297700 secs
2014-06-07 19:50:25.473 MpCalc[40426:8303] patch sin(2) @ 1000000 1.296200 secs
2014-06-07 19:50:29.601 MpCalc[40426:8403] patch sin(2) @ 1000000 1.296100 secs
2014-06-07 19:50:33.018 MpCalc[40426:8303] patch sin(2) @ 1000000 1.295900 secs
2014-06-07 19:50:36.505 MpCalc[40426:8303] patch sin(2) @ 1000000 1.295800 secs
2014-06-07 19:50:40.475 MpCalc[40426:8303] patch sin(2) @ 1000000 1.298200 secs
2014-06-07 19:50:43.870 MpCalc[40426:8403] patch sin(2) @ 1000000 1.296300 secs
2014-06-07 19:50:47.482 MpCalc[40426:8403] patch sin(2) @ 1000000 1.297600 secs
2014-06-07 19:50:50.845 MpCalc[40426:8507] patch sin(2) @ 1000000 1.297000 secs
2014-06-07 19:50:54.277 MpCalc[40426:7b0b] patch sin(2) @ 1000000 1.298300 secs
avg. 1.29691
2014-06-07 19:51:20.164 MpCalc[40426:8303] patch sin(2) @ 5000000 10.490500 secs
2014-06-07 19:51:38.039 MpCalc[40426:7b0f] patch sin(2) @ 5000000 10.479600 secs
2014-06-07 19:51:50.937 MpCalc[40426:7b0f] patch sin(2) @ 5000000 10.482300 secs
2014-06-07 19:52:03.633 MpCalc[40426:7b0f] patch sin(2) @ 5000000 10.493300 secs
2014-06-07 19:52:16.232 MpCalc[40426:1b1f] patch sin(2) @ 5000000 10.457800 secs
2014-06-07 19:52:28.906 MpCalc[40426:6e17] patch sin(2) @ 5000000 10.498700 secs
2014-06-07 19:52:41.608 MpCalc[40426:6e17] patch sin(2) @ 5000000 10.472900 secs
2014-06-07 19:52:54.131 MpCalc[40426:6e17] patch sin(2) @ 5000000 10.488200 secs
2014-06-07 19:53:06.927 MpCalc[40426:6e17] patch sin(2) @ 5000000 10.485200 secs
2014-06-07 19:53:19.459 MpCalc[40426:6e17] patch sin(2) @ 5000000 10.477700 secs
avg. 10.48262
2014-06-07 19:53:55.309 MpCalc[40426:6a27] patch sin(2) @ 10000000 24.895100 secs
2014-06-07 19:54:25.603 MpCalc[40426:851f] patch sin(2) @ 10000000 24.774700 secs
2014-06-07 19:54:54.889 MpCalc[40426:3f33] patch sin(2) @ 10000000 24.782300 secs
2014-06-07 19:55:21.859 MpCalc[40426:822b] patch sin(2) @ 10000000 24.780700 secs
2014-06-07 19:55:48.806 MpCalc[40426:7d23] patch sin(2) @ 10000000 24.772900 secs
2014-06-07 19:56:15.762 MpCalc[40426:7d23] patch sin(2) @ 10000000 24.764100 secs
2014-06-07 19:56:43.546 MpCalc[40426:7c43] patch sin(2) @ 10000000 24.853000 secs
2014-06-07 19:57:10.515 MpCalc[40426:7c43] patch sin(2) @ 10000000 24.768600 secs
2014-06-07 19:57:37.508 MpCalc[40426:7c43] patch sin(2) @ 10000000 24.771100 secs
2014-06-07 19:58:18.561 MpCalc[40426:7153] patch sin(2) @ 10000000 25.037900 secs
avg. 24.82004