Okular consumes an enormous amount of Memory (over 1GB)

Okular consumes an enormous amount of Memory (it reached over 1Gb today).
I got the same tab list opened (and loaded) over the weeks (even months): it consists of 7 or 8 tabs the size of each is in range 4 to 17 Mb (there’s no large files).

KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
Kernel Version: 5.14.10-1-MANJARO (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i7-8750H CPU @ 2.20GHz
Memory: 15,5 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1060 with Max-Q Design/PCIe/SSE2
Okular Version 21.08.2

Settings -> Configure Okular -> Performance -> Memory Usage -> Low

In my computer, memory usage remains ~200 MB, even when a 250 page document is kept open for hours. Otherwise, Okular caches many pages, and consumes a lot of memory (although the performance is not much different).

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I’ve set that Memory Usage -> Low setting, but still encountering memory spikes.