Screen painting is slow enough to be observed. Single, two or three mouse clicks on page-up and page-down areas on the scrollbar cause numerous page-up or page-down reactions, leading to scrolling well past the intended location and ongoing struggle to go to a desired location in Calc and Base (not Writer).
Just upgraded (using downloaded installers) from LibreOffice_5.2.3_Win_x86 to LibreOffice_5.3.4_Win_x64 (Version: 126.96.36.199 (x64), Build ID: f82d347ccc0be322489bf7da61d7e4ad13fe2ff3 CPU Threads: 4; OS Version: Windows 6.1; UI Render: default; Layout Engine: new; Locale: en-US (en_US)). Operating system is Windows 7 64-bit. The prior version of LibreOffice was uninstalled before the newer version of LibreOffice was installed. I’m using a notebook computer with trackpad, all special features disabled except tap to click.
I had just started using Base with its native database engine and found scrolling to be over-aggressive. Clicking the scrollbar’s line-down or line-up arrowhead worked fine, but a click or two (whether with the mouse’s physical button or with a touchpad tap to click) on the scrollbar’s page-up or page-down area would result in numerous page-up or page-down reactions, scrolling well past the intended destination, with scrolling taking place with significant delay. The database would often scroll near or to the bottom, or near or to the top. Navigation through the database was clumsy. Luckily, neither Calc nor Writer were affected.
So I upgraded to 5.3.4. Now screen painting is noticeably slow overall; Base continues to scroll over-aggressively as described; and Calc shows this type of over-aggressive scrolling, too. The overall slowdown feels sluggish, and gets especially bad when View > Data Sources is used to access a table from Calc, a table with about 100 records and 10 fields. Writer is slower to paint the screen, too, but it does not exhibit the over-aggressive scrolling behavior.
To get Calc to work faster I have started a new profile; I have unchecked the selection for using the Java runtime environment; I have increased the image cache to 512MB, memory per object to 15MB, and number of objects to 75 (I do not embed graphics in my documents or database); I have disabled OpenGL (later re-enabled it); I have allowed use of OpenCL (with and without OpenGL, later disabled it); and I have made sure not to start other applications. Slow screen painting and over-aggressive response to mouse page-up and page-down click events continue and no improvement is observed.
Screen painting is sufficiently slow that, when going through Tools > Options, you can watch the individually selected windows “unfurl”, you can experience the window get populated with its UI elements. Graphics acceleration has been on throughout. Slow screen painting affects Calc throughout its operation. It also has an observable effect on Writer.
Applications other than those in LibreOffice are not affected.
What would you like me to try to help isolate the cause? What can I do to restore the speed of screen painting speed of LibreOffice 5.2.3 to LibreOffice 5.3.4? How can over-aggressive responses to mouse page-up and page-down events be limited to one response per click? Thank you for your help!
(Note: I do not have a “Scroll Lock” button on my notebook’s keyboard)
(Update: Accessibility - assistive technology tools have not been selected)