The Wi-Fi becomes extremely slow upon startup or disconnects

[Dionatan F.S]

The Wi-Fi becomes extremely slow upon startup or disconnects, unless I always run the command sudo iwconfig wlp2s0 power off at startup. When I do this, it works but never at the maximum available speed.
The problem is not new and was always solved by using Additional Drivers. However, this option is no longer available, and the issue with the driver (RTL8821CE) has only changed.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.18
ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
Uname: Linux 6.8.0-31-generic x86_64
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CrashReports:
 640:1000:110:8331988:2024-05-24 03:31:13.612399854 -0300:2024-05-24 03:31:07.451400056 -0300:/var/crash/_usr_lib_x86_64-linux-gnu_libexec_baloo_file.1000.crash
 640:1000:110:5434519:2024-05-26 04:07:02.657702929 -0300:2024-05-26 04:06:57.694822138 -0300:/var/crash/_opt_Mullvad VPN_mullvad-gui.1000.crash
 640:0:110:34163:2024-05-23 23:00:28.617607426 -0300:2024-05-23 22:56:44.675060025 -0300:/var/crash/_usr_lib_systemd_systemd-journald.0.crash
CurrentDesktop: KDE
Date: Wed May 29 18:22:59 2024
InstallationDate: Installed on 2024-05-23 (6 days ago)
InstallationMedia: Kubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240425.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)