http://www.networkworld.com/article/2923886/servers/utah-researchers-make-light-speed-computing-breakthrough.html
Supercomputers & computing devices in general can always get faster. Its just a matter of the level of the science & technology. Of course, the natural speed of light remains as a key barrier. Perhaps some ET civilizations have long since passed the light speed barrier.
http://www.networkworld.com/article/2872645/education/10-cool-network-and-computing-research-projects.html
http://www.nature.com/search?q=supercomputers&q_match=all&sp-a=sp1001702d&sp-m=0&sp-p-1=phrase&sp-sfvl-field=subject%7Cujournal&sp-x-1=ujournal&submit=go