CNBC sheds some light on the recent debate in the bitcoin space about increasing the size of the blocks in the bitcoin blockchain to increase the speed of transactions bitcoin can handle
The issue at hand is about the structure of bitcoin's blockchain (which is composed of "blocks" of data with each block referring back to the preceding chunk of information—thereby creating a chain). The community is arguing about how big the maximum block size should be: The current max is one megabyte, which only allows for about seven transactions per second—far too few for most businesses currently investing in the technology.
http://www.cnbc.com/2015/07/23/bitcoins-war-could-threaten-its-survival.html