Currently we have reached some frontier where it is exceptionally "expensive" to increase the speed of the logic of a single core. This is the reason why microcontrollers resp microprocessors are currently not getting significantly faster but instead get multiple cores. And supercomputers consist of thousands of cores.

Regarding your original question: for an individual core we haven't yet reached the physical limit, but we are not far from that. But we have already found a way out: parallelism.

So: yes - "computers" can continue to get faster.

Dear Oussama Noui, Do I get it right ? 

Ultra-intelligent machines will be the last inventions man ever makes. So, in short, once artificial intelligence is really developed, new machines can develop faster and we will have supercomputers to be far superior than we are. This scenario is studied by many computer scientists as the ‘technological singularity’.One could also limit the theoretical performance of a rather practical "ultimate laptop" with a mass of one kilogram and a volume of one litre. This is done by considering the speed of light, the quantum scale, the gravitational constant and the Boltzman constant, giving a performance of 5.4258×10505.4258×1050 logical operations per second on approximately 1031 bits.

Currently we have reached some frontier where it is exceptionally "expensive" to increase the speed of the logic of a single core. This is the reason why microcontrollers resp microprocessors are currently not getting significantly faster but instead get multiple cores. And supercomputers consist of thousands of cores.

Regarding your original question: for an individual core we haven't yet reached the physical limit, but we are not far from that. But we have already found a way out: parallelism.

So: yes - "computers" can continue to get faster.

See, the speed and memory capacity would be increasing like anything BUT the computers will be always Artificial Intelligent Machine!