The phrase "scalability issues" refers to problems or limitations that arise when a system or technology is unable to handle increased demands or growth in an efficient and effective manner. Full definition
Plasma, an Ethereum scaling solution, could become a practical solution to the severe scalability issues of blockchain networks. (thenextweb.com)
McAfee went on to say that he thinks Rootstock, which will operate atop the Bitcoin network, will solve scalability issues by a factor of hundreds. (ethnews.com)
The security, privacy, and scalability issues faced by blockchain are unprecedented because decentralized applications and protocols have never been tested before. (thenextweb.com)