Operating system: Windows
Graphics card: GTX 960
Broken: 2.80 9149e894210
Short description of error
Repeated hiding and unhiding of objects causes Blender's total memory usage to rise. Higher numbers of objects (presumably also polycounts) have a larger impact.
Exact steps for others to reproduce the error
Repeatedly hide and unhide any number of objects in the viewport - I used the eye icon in the Outliner.