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I have a Java file with 216 lines. - I put the cursor in the first line - Select the line by pressing <shift><cursor-down> - Then I keep pressing <cursor-down> until the end of the file is reached (so that the lines below are selected too) => This takes about 18 seconds on my computer Code minings (method parameter names) are turned on. But even without this the performance is still not very good. Interesting: The selection runs pretty fast at the beginning, but as soon as I reach the text editor view boundary (i.e. as soon as the editor needs to scroll) it starts running very slow. I'm not sure if this should be considered a bug or a performance enhancement. Feel free to switch the severity. I'm just saying a performance improvement in this area would be highly user-visible and would make many users happy :-)
Which Eclipse version are you using? See also bug 366471.
I'm using 4.15.0 on macOS Catalina on "MacBook Pro (15-inch, 2017)".
Can reproduce. Doesn't seem to be related to bug 366471. Occurs only when the selection is extended via the keyboard; selecting with the mouse (moving the mouse cursor below the bottom border of the view to keep extending the selection) is normally fast, and *much* faster than the keyboard method. Also not a regression; it's similarly slow in Eclipse 2018-12. Not specific to Java files either, can also reproduce with a plain text file.
