Problems with speed of internet wifi connection

Hi ,
yesterday update from Manjaro XFCE 21.3.5 on Manjaro XFCE 21.3.6 and update of kernel 5.15.55_rt48-1 maked me problems with speed of internet wifi connection on laptop Asus . Internet connection speed is now 1.5 MB/s and should be 3.5 MB/s and also wifi showing less internet sites . What to do ? Thank you .

System:
  Kernel: 5.15.55-1-rt48-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 12.1.0
    parameters: BOOT_IMAGE=/boot/vmlinuz-5.15-rt-x86_64
    root=UUID=302727e3-3f89-4267-ad73-68a326057b09 rw quiet apparmor=1
    security=apparmor udev.log_priority=3
  Desktop: Xfce v: 4.16.0 tk: Gtk v: 3.24.29 info: xfce4-panel wm: xfwm
    v: 4.16.1 vt: 7 dm: LightDM v: 1.30.0 Distro: Manjaro Linux base: Arch Linux
Machine:
  Type: Laptop System: ASUSTeK product: VivoBook_ASUSLaptop X571GD_X571GD
    v: 1.0 serial: <superuser required>
  Mobo: ASUSTeK model: X571GD v: 1.0 serial: <superuser required>
    UEFI: American Megatrends v: X571GD.312 date: 09/15/2021
Battery:
  ID-1: BAT1 charge: 23.7 Wh (88.1%) condition: 26.9/42.3 Wh (63.6%)
    volts: 11.0 min: 11.6 model: ASUS A32-K55 type: Li-ion serial: N/A
    status: discharging
Memory:
  RAM: total: 7.62 GiB used: 1.66 GiB (21.8%)
  RAM Report: permissions: Unable to run dmidecode. Root privileges
    required.
CPU:
  Info: model: Intel Core i5-8300H bits: 64 type: MT MCP arch: Coffee Lake
    gen: core 8 built: 2018 process: Intel 14nm family: 6 model-id: 0x9E (158)
    stepping: 0xA (10) microcode: 0xF0
  Topology: cpus: 1x cores: 4 tpc: 2 threads: 8 smt: enabled cache:
    L1: 256 KiB desc: d-4x32 KiB; i-4x32 KiB L2: 1024 KiB desc: 4x256 KiB
    L3: 8 MiB desc: 1x8 MiB
  Speed (MHz): avg: 800 min/max: 800/4000 scaling: driver: intel_pstate
    governor: powersave cores: 1: 800 2: 800 3: 800 4: 800 5: 800 6: 800 7: 800
    8: 800 bogomips: 36799
  Flags: 3dnowprefetch abm acpi adx aes aperfmperf apic arat
    arch_capabilities arch_perfmon art avx avx2 bmi1 bmi2 bts clflush
    clflushopt cmov constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64
    dtherm dts epb ept ept_ad erms est f16c flexpriority flush_l1d fma fpu
    fsgsbase fxsr ht hwp hwp_act_window hwp_epp hwp_notify ibpb ibrs ida
    intel_pt invpcid invpcid_single lahf_lm lm mca mce md_clear mmx monitor
    movbe mpx msr mtrr nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq pdcm
    pdpe1gb pebs pge pln pni popcnt pse pse36 pti pts rdrand rdseed rdtscp
    rep_good sdbg sep smap smep ss ssbd sse sse2 sse4_1 sse4_2 ssse3 stibp
    syscall tm tm2 tpr_shadow tsc tsc_adjust tsc_deadline_timer vme vmx vnmi
    vpid x2apic xgetbv1 xsave xsavec xsaveopt xsaves xtopology xtpr
  Vulnerabilities:
  Type: itlb_multihit status: KVM: VMX disabled
  Type: l1tf mitigation: PTE Inversion; VMX: conditional cache flushes, SMT
    vulnerable
  Type: mds mitigation: Clear CPU buffers; SMT vulnerable
  Type: meltdown mitigation: PTI
  Type: mmio_stale_data mitigation: Clear CPU buffers; SMT vulnerable
  Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
    prctl and seccomp
  Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
    sanitization
  Type: spectre_v2 mitigation: Retpolines, IBPB: conditional, IBRS_FW,
    STIBP: conditional, RSB filling
  Type: srbds mitigation: Microcode
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: Intel CoffeeLake-H GT2 [UHD Graphics 630] vendor: ASUSTeK
    driver: i915 v: kernel arch: Gen-9.5 process: Intel 14nm built: 2016-20
    ports: active: eDP-1 empty: HDMI-A-1 bus-ID: 00:02.0 chip-ID: 8086:3e9b
    class-ID: 0300
  Device-2: NVIDIA GP107M [GeForce GTX 1050 Mobile] vendor: ASUSTeK
    driver: N/A alternate: nouveau non-free: 515.xx+ status: current (as of
    2022-07) arch: Pascal code: GP10x process: TSMC 16nm built: 2016-21 pcie:
    gen: 3 speed: 8 GT/s lanes: 16 bus-ID: 01:00.0 chip-ID: 10de:1c92
    class-ID: 0302
  Device-3: IMC Networks USB2.0 HD UVC WebCam type: USB driver: uvcvideo
    bus-ID: 1-7:4 chip-ID: 13d3:56a8 class-ID: 0e02 serial: <filter>
  Display: x11 server: X.Org v: 21.1.4 compositor: xfwm v: 4.16.1 driver: X:
    loaded: modesetting alternate: fbdev,vesa gpu: i915 display-ID: :0.0
    screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22")
    s-diag: 582mm (22.93")
  Monitor-1: eDP-1 model: LG Display 0x0563 built: 2018 res: 1920x1080
    dpi: 142 gamma: 1.2 size: 344x194mm (13.54x7.64") diag: 395mm (15.5")
    ratio: 16:9 modes: 1920x1080
  OpenGL: renderer: Mesa Intel UHD Graphics 630 (CFL GT2) v: 4.6 Mesa 22.1.4
    direct render: Yes
Audio:
  Device-1: Intel Cannon Lake PCH cAVS vendor: ASUSTeK driver: snd_hda_intel
    v: kernel alternate: snd_soc_skl,snd_sof_pci_intel_cnl bus-ID: 00:1f.3
    chip-ID: 8086:a348 class-ID: 0403
  Sound Server-1: ALSA v: k5.15.55-1-rt48-MANJARO running: yes
  Sound Server-2: JACK v: 1.9.21 running: no
  Sound Server-3: PulseAudio v: 16.1 running: yes
  Sound Server-4: PipeWire v: 0.3.56 running: yes
Network:
  Device-1: Realtek RTL8821CE 802.11ac PCIe Wireless Network Adapter
    vendor: AzureWave driver: rtw_8821ce v: N/A modules: rtw88_8821ce pcie:
    gen: 1 speed: 2.5 GT/s lanes: 1 port: 4000 bus-ID: 03:00.0
    chip-ID: 10ec:c821 class-ID: 0280
  IF: wlp3s0 state: up mac: <filter>
  IP v4: <filter> type: dynamic noprefixroute scope: global
    broadcast: <filter>
  IP v6: <filter> type: noprefixroute scope: link
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
    vendor: ASUSTeK driver: r8169 v: kernel pcie: speed: Unknown lanes: 63
    link-max: gen: 6 speed: 64 GT/s port: 3000 bus-ID: 04:00.0
    chip-ID: 10ec:8168 class-ID: 0200
  IF: enp4s0 state: down mac: <filter>
  WAN IP: <filter>
Bluetooth:
  Device-1: IMC Networks Bluetooth Radio type: USB driver: btusb v: 0.8
    bus-ID: 1-14:5 chip-ID: 13d3:3529 class-ID: e001 serial: <filter>
  Report: rfkill ID: hci0 rfk-id: 3 state: down bt-service: enabled,running
    rfk-block: hardware: no software: yes address: see --recommends
Logical:
  Message: No logical block device data found.
RAID:
  Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci
    v: 3.0 port: 6060 bus-ID: 00:17.0 chip-ID: 8086:282a rev: N/A class-ID: 0104
Drives:
  Local Storage: total: 1.14 TiB used: 120.49 GiB (10.3%)
  SMART Message: Required tool smartctl not installed. Check --recommends
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: SK Hynix
    model: HFM256GDJTNG-8310A size: 238.47 GiB block-size: physical: 512 B
    logical: 512 B speed: 15.8 Gb/s lanes: 2 type: SSD serial: <filter>
    rev: 80001C00 temp: 31.9 C scheme: GPT
  ID-2: /dev/sda maj-min: 8:0 vendor: Toshiba model: MQ04ABF100
    size: 931.51 GiB block-size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s
    type: HDD rpm: 5400 serial: <filter> rev: 1J scheme: GPT
  Message: No optical or floppy data found.
Partition:
  ID-1: / raw-size: 931.22 GiB size: 915.53 GiB (98.32%) used: 120.49 GiB
    (13.2%) fs: ext4 dev: /dev/sda2 maj-min: 8:2 label: N/A
    uuid: 302727e3-3f89-4267-ad73-68a326057b09
  ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%) used: 312 KiB
    (0.1%) fs: vfat dev: /dev/sda1 maj-min: 8:1 label: NO_LABEL
    uuid: B50C-F27D
Swap:
  Alert: No swap data was found.
Unmounted:
  ID-1: /dev/nvme0n1p1 maj-min: 259:1 size: 512 MiB fs: vfat label: N/A
    uuid: 94C7-8681
  ID-2: /dev/nvme0n1p2 maj-min: 259:2 size: 237.97 GiB fs: ext4 label: N/A
    uuid: 5ab257b6-d061-403a-8735-39b0d4d13e0e
USB:
  Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 16 rev: 2.0
    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
  Device-1: 1-1:2 info: Sunplus Innovation Optical Mouse type: Mouse
    driver: hid-generic,usbhid interfaces: 1 rev: 2.0 speed: 1.5 Mb/s
    power: 98mA chip-ID: 1bcf:0005 class-ID: 0301
  Device-2: 1-6:3 info: Realtek RTS5129 Card Reader Controller
    type: <vendor specific> driver: rtsx_usb,rtsx_usb_ms,rtsx_usb_sdmmc
    interfaces: 1 rev: 2.0 speed: 480 Mb/s power: 500mA chip-ID: 0bda:0129
    class-ID: ff00 serial: <filter>
  Device-3: 1-7:4 info: IMC Networks USB2.0 HD UVC WebCam type: Video
    driver: uvcvideo interfaces: 2 rev: 2.0 speed: 480 Mb/s power: 500mA
    chip-ID: 13d3:56a8 class-ID: 0e02 serial: <filter>
  Device-4: 1-14:5 info: IMC Networks Bluetooth Radio type: Bluetooth
    driver: btusb interfaces: 2 rev: 1.1 speed: 12 Mb/s power: 500mA
    chip-ID: 13d3:3529 class-ID: e001 serial: <filter>
  Hub-2: 2-0:1 info: Super-speed hub ports: 8 rev: 3.1 speed: 10 Gb/s
    chip-ID: 1d6b:0003 class-ID: 0900
Sensors:
  System Temperatures: cpu: 36.0 C pch: 44.0 C mobo: N/A
  Fan Speeds (RPM): cpu: 0
Info:
  Processes: 295 Uptime: 4m wakeups: 4 Init: systemd v: 251 default: graphical
  tool: systemctl Compilers: gcc: 12.1.0 clang: 14.0.6 Packages: 1196
  pacman: 1189 lib: 346 flatpak: 7 Shell: Bash v: 5.1.16
  running-in: xfce4-terminal inxi: 3.3.20

why are you using kernel-rt ?

Because I tried more kernels and old kernel was -rt and interned worked very well , speed 3.5 MB/s downloading , it was stable and quick connection . Thank you

And I have wifi realtek rtl8821ce .

And I used this commnd for install wifi driver and dont know How to uninnstall this .

pamac build rtl8821ce-dkms-git

Maybe I should use another, older driver

$ pamac search RTL8821CE
rtl8821ce-dkms-git                                                                                                                                                                                                                1.0.5.r36.gca4abd8-1  AUR
rtl8821CE driver with firmware

Using real time kernels makes no sense for such testing.

Check pacman.log - were mkinitcpio and kmod packages updated?

Realtime kernels have absolutely nothing to do with internet speed. Install a current LTS or stable kernel.

I’ve edited your topic title to be more concise. Please see How to Post

Now its ok, I used LTS kernel and internet speed is good , thank you

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