Since swift is released as open source it would be interesting to compare swift performances. I found the interesting project http:&#x2F;&#x2F;github.com&#x2F;andreaferretti&#x2F;kmeans that compares the execution time of the KMeans algorithm  on several languages.<p>From the results it looks like that the execution time is comparable to python and it is pretty distant from the top.<p>http:&#x2F;&#x2F;github.com&#x2F;andreaferretti&#x2F;kmeans&#x2F;blob&#x2F;master&#x2F;results
Results
-------
nim (0.11.3) 148 ms
java (1.7.0_76) 183 ms
....
python (2.7.6) 10632 ms
pharo (3) 11170 ms
swift (2.2-dev) 11391 ms
perl (5.20.2) 15680 ms
rubinius (2.5.2) 20878 ms
ruby (1.9.3p484) 24819 ms
On comparing Swift runtime performances