How to deal with network jitter on macOS Tahoe (26.4)?

My macOS startup drive died. I reinstalled it through the Recovery Menu to macOS Sequoia (15.6). However, I started noticing internet lag, also known as jitter. I hadn't encountered this problem before, and I haven't replaced my computer. Only the thing that I tried its update my macOS to Tahoe (26.4). This problem almost invisible in surfing or programming cases but in cases when I do sync or commit/pulls and it's so annoying. I use a 5GHz Wi-Fi network; I can't use an Ethernet cable. Device : MacBook Pro 16-inch 2019, macOS Tahoe (26.4). Router : Tenda AC5 WiFi5/AC1200. Modem : FoxGate ONU G

Question by Wargos on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.