Bandwidth
From Wiki
The amount of data that can be transmitted along a communications channel in a fixed amount of time. For digital devices, the bandwidth is usually expressed in bits per second (bps) or bytes per second, where 1 byte = 8 bits.
Attention Management Slang:
When you are too busy to take on one more task, or you are multi-tasking and your effectiveness will be seriously reduced by any other distractions you may say "I do not have the bandwidth for this project at this time."