Using the just released about:performance I discovered that Sage is slowing down my Firefox:
"Sage has slown down Firefox frequently. When this happens, the slowdown is generally important"
Impact on framerate: 271 high-impacts, 5 medium-impact (3 alerts).
CPU usage: 2% (total 3108058ms).
System usage: 1% (total 120460ms).
Blocking process calls: 0% (total 0ms).
Measure start: 2609 seconds ago.
Using the just released about:performance I discovered that Sage is slowing down my Firefox: "Sage has slown down Firefox frequently. When this happens, the slowdown is generally important" Impact on framerate: 271 high-impacts, 5 medium-impact (3 alerts). CPU usage: 2% (total 3108058ms). System usage: 1% (total 120460ms). Blocking process calls: 0% (total 0ms). Measure start: 2609 seconds ago.
Sage 1.5.4 Firefox 47 Kubuntu 16.04 64bit