Framerate slammed when editor tooltips are shown
When playing a level in the active level editor, I've been puzzling over a strange drop in framerate from 100 fps to about 12 fps. This has been happening since 4.5 and into 4.7.6 on Win7.
As it turns out, moving the mouse over some areas of the editor UI will cause the framerate to drop. Mouse over editor whitespace areas and the framerate recovers.
Not everything in the UI causes this drop. However if you mouse over a tool / icon / asset / menu that will generate a tooltip the fps drops as the tooltip appears and will stay slow until all tooltips are destroyed.
Occasionally the fps will not recover and the problem seems to get worse as the fps declines in steps. Maybe the first 'stuck' drop is to 50 fps, the second step down puts my level at 25, the third at 18 - and so on. Restarting the game in the level editor does not fix or reverse the loss. Generally when the decrease in fps get stuck I've been running the game in a standalone viewport.
I believe what is happening when the fps decrease becomes 'permanent' is that tooltips have been displayed but not cleaned up correctly.
The way the UE4 editor and Win 7 handle mouse activity when a different application (Internet Explorer, Maya) is overlapping and in front of UE4 has always bugged me. Way too much activity on UE4 as it manages to track mouse movements even while the mouse is directly over the third party app. Essentially the mouse movements fall thru Internet Explorer while I'm here in the AnswerHub and cause the highlight to move to 'Cylinder' as pictured here. Tooltips don't generally appear until the mouse is directly over the backgrounded UE4 but they get very annoying, track the mouse, and don't play nice.
Oddly, the last two times the fps dropped to pathetic levels and got stuck the cure was the same. I simply started the Windows Task manager, looked around, made no changes, and closed it. FPS was restored as a result. Maybe this or time cleaned up a tooltip process?
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asked Apr 26 '15 at 08:45 AM in Bug Reports
This problem with framerate & tooltips disappeared from my dev machine a few days ago.
Wiped my machine, installed Windows 10, and reinstalled UE 4.9. I had been on Win7 with Nvidia, ASRock, and AMD drivers and utilities installed. Windows 10 has much better support for the hardware and UE4 seems to run well on it.
answered Oct 19 '15 at 05:04 AM
Eric, This FPS tooltip bug on my machine might develop into a feature request - it can be very useful.
I didn't appreciate that I had my 'rate of turn' for the character nav linked to frame rate - until I moved the project to my MacBook Pro. It takes a few minutes to copy the project to the MacBook so I was looking for a way to reduce the framerate of the game in PIE on the PC.
Using a project setting of 'Fixed Frame Rate' or setting the max smoothed frame rate - I can't get the frame rate to drop below 60 in PIE. But the tool tip bug gets me down to about 17 fps which is nearly perfect for emulating the speed on the MacBook.
So that has me wishing for three or four toolbar buttons that I can press or hover over during PIE - to instantly switch the actual FPS of the game to 15, 25, 40, and 60 fps for example.
answered May 27 '15 at 05:04 AM
This resolved my issue https://answers.unrealengine.com/questions/731664/major-fps-drop-in-418-bug.html
answered Dec 18 '17 at 07:56 PM
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