LibreOffice 25.8: slow performance

[Uka]

Since I updated to LibreOffice 25.8 (currently 25.8.3.2, tested also with 25.2.7.2), I have encountered constant sluggishness in performance with any larger files (for example 1 Mb odt file with some 250 pages, footnotes, cross references and tables; 12 Mb ods file with 25 000 rows × 133 columns).

Slow performance is already obvious with the aforementioned text file: even basic actions such as typing and scrolling are laggy.

Even more annoying it is with LO Calc: I did a test performing the same action on two copies of the same file with 25.8.3.2 and 24.2.7.2:
Action: sort in ascending order (with 1 sorting criterium), performed on the data set of 25 000 rows × 133 columns.
Results:
– with v. 24.2.7.2 the action took 1 min 46 sec – which is acceptable;
– with v. 25.8.3.2: 8 min 52 sec – that is over five times longer.

Are there some critical configurations that can improve the performance considerably, or is there reason to file in a bug report?

Edit: Operating on Ubuntu 24.04.2 LTS

[ajlittoz]

Regarding Writer documents, strict styling dramatically improves performance compare to direct formatting.

Also, look at your tables. If cells contains so much data as to extend over several pages, you face a cache problem: apparently Writer collects full row data before rendering (needed to compute page break locations). You may consider splitting such “monster” cells into smaller ones (several rows) if this makes sense.

[Uka]

Sure, I’m aware of this. However, I’m just wondering about the LO versions, as the difference in performance speed is so obvious between (e.g.) 25.8.3.2 and 24.2.7.2.