Figure 3: Drive and CPU usage during the whole-slide viewing test. Drive usage (top) was monitored and logged using the Windows Performance Monitor before and during the test. The start of the first trial is denoted by the black arrow. Disk transfer/s represents the number of transfers to and from the hard disk drive or solid-state drive/s. Higher values suggest higher data throughput. CPU usage (bottom) was likewise monitored, and the percentage of processor time represents the amount of CPU usage relative to its capabilities. Gray: sample i3-hard disk drive computer. Black: same computer following drive upgrade. The solid-state drive-based computer was able to complete three trials in the time it took the hard disk drive-based computer to complete one. Note that the hard disk drive-based computer never quite reached 100% CPU usage as disk speed appeared to be the bottleneck