Description:
When I am using Spreadsheet, a "Not Responding" (NR) notice appears at the top of the screen where document name is shown every time I attempt a new task. For example, after I click to highlight a new row or new column; and, after I tab from one cell to the next; and, after I click on PGUP; and, when I start typing new text, etc., the program stops functioning for several seconds, that is, the program freezes. Afterwards, the NR message pops up. The program has never crashed on me while this happens. Spreadsheet eventually un-freezes and NR disappears. After the NR message disappears, the program completes whatever task I attempted. It takes several seconds for the entire process to complete; I haven't counted but I believe about 5 seconds from when program freezes to when program does whatever I typed on keyboard. 

Steps to Reproduce:
1. In Spreadsheet, tap any key (e.g., highlight row) or attempt any function (e.g., CTRL + x) on keyboard
2. program freezes
3. Not Responding appears at top of screen
4. after several seconds, Not Responding disappears
5. Spreadsheet completes task

Actual Results:
N/A unless you mean step 5 above

Expected Results:
Software should not freeze


Reproducible: Always


User Profile Reset: Yes

Additional Info:
Version: 7.5.6.2 (X86_64) / LibreOffice Community
Build ID: f654817fb68d6d4600d7d2f6b647e47729f55f15
CPU threads: 4; OS: Windows 6.1 Service Pack 1 Build 7601; UI render: Skia/Raster; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: threaded