I have x1 question & x1 request

My question is that encircled letter / numbers characters that are visible in SMath under WIN11x64 but are not visible under SMath mono Ubuntu arm64 (Raspberry Pi 5). I tried installing different fonts but to no avail

My request is that I am attaching my sheet & it takes 1.5minutes in intel N150 machine & 3.7 minutes under Raspberry Pi 5. Can somone audit my sheet & tell me how to optimise it?

HCl recycle.sm (68,85 KiB) scaricato 728 volta(e).
HCl recycle.pdf (379,42 KiB) scaricato 607 volta(e).

Hi. Try this please. Modifications marked with boxes.

HCl recycle.sm (71,62 KiB) scaricato 733 volta(e).

Best regards.
Alvaro.