Can't use WiFi since I installed Manjaro

I recently installed Manjaro in my working laptop. It does connect to WiFi, but it gets impossible to use it. I can’t work on my laptop anymore. WiFi gets too slow, and to load 1 single page it takes some 30 minutes. I already tested multiple WiFi networks, in 2 different states in my country. Always the same trouble. That doesn’t happen through the smartphone hotspot.

  Kernel: 5.7.15-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.1.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.7-x86_64 
  root=UUID=0d7b8949-703c-4981-afe0-0da33ed5aac8 rw quiet 
  root=/dev/mapper/luks-f479f34d-14df-480a-a896-df74249e2a00 apparmor=1 
  Desktop: Xfce 4.14.2 tk: Gtk 3.24.20 info: xfce4-panel wm: xfwm4 
  dm: LightDM 1.30.0 Distro: Manjaro Linux 
  Type: Laptop System: LG product: U460-G.BG32P1 v: 1.0 serial: <filter> 
  Chassis: type: 9 v: 0.1 serial: <filter> 
  Mobo: LG model: U560 v: 1.0 serial: <filter> UEFI: Phoenix v: UNCNSF0E 
  date: 12/30/2013 
  ID-1: CMB0 charge: 0.1 Wh condition: 36.0/48.6 Wh (74%) volts: 8.0/7.6 
  model: LG LGC-LGC type: Li-ion serial: <filter> status: Charging 
  cycles: 1043 
  RAM: total: 3.71 GiB used: 1.55 GiB (41.9%) 
  RAM Report: 
  permissions: Unable to run dmidecode. Root privileges required. 
  Topology: Dual Core model: Intel Core i3-3227U bits: 64 type: MT MCP 
  arch: Ivy Bridge family: 6 model-id: 3A (58) stepping: 9 microcode: 21 
  L2 cache: 3072 KiB bogomips: 15168 
  Speed: 798 MHz min/max: 800/1900 MHz Core speeds (MHz): 1: 798 2: 798 
  3: 798 4: 798 
  Flags: acpi aperfmperf apic arat arch_perfmon avx bts clflush cmov 
  constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64 dtherm dts epb 
  ept erms est f16c flexpriority flush_l1d fpu fsgsbase fxsr ht ibpb ibrs 
  ida lahf_lm lm mca mce md_clear mmx monitor msr mtrr nonstop_tsc nopl nx 
  pae pat pbe pcid pclmulqdq pdcm pebs pge pln pni popcnt pse pse36 pti pts 
  rdtscp rep_good sep smep ss ssbd sse sse2 sse4_1 sse4_2 ssse3 stibp 
  syscall tm tm2 tpr_shadow tsc tsc_deadline_timer vme vmx vnmi vpid x2apic 
  xsave xsaveopt xtopology xtpr 
  Vulnerabilities: Type: itlb_multihit status: KVM: Split huge pages 
  Type: l1tf 
  mitigation: PTE Inversion; VMX: conditional cache flushes, SMT vulnerable 
  Type: mds mitigation: Clear CPU buffers; SMT vulnerable 
  Type: meltdown mitigation: PTI 
  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: Full generic retpoline, IBPB: conditional, 
  IBRS_FW, STIBP: conditional, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
  Device-1: Intel 3rd Gen Core processor Graphics vendor: LG driver: i915 
  v: kernel bus ID: 00:02.0 chip ID: 8086:0166 
  Device-2: Silicon Motion type: USB driver: uvcvideo bus ID: 1-1.1:3 
  chip ID: 2232:1053 
  Display: x11 server: X.Org 1.20.8 driver: intel unloaded: modesetting 
  alternate: fbdev,vesa display ID: :0.0 screens: 1 
  Screen-1: 0 s-res: 1366x768 s-dpi: 96 s-size: 361x203mm (14.2x8.0") 
  s-diag: 414mm (16.3") 
  Monitor-1: LVDS1 res: 1366x768 hz: 60 dpi: 112 size: 310x170mm (12.2x6.7") 
  diag: 354mm (13.9") 
  OpenGL: renderer: Mesa DRI Intel HD Graphics 4000 (IVB GT2) 
  v: 4.2 Mesa 20.1.5 compat-v: 3.0 direct render: Yes 
  Device-1: Intel 7 Series/C216 Family High Definition Audio vendor: LG 
  driver: snd_hda_intel v: kernel bus ID: 00:1b.0 chip ID: 8086:1e20 
  Sound Server: ALSA v: k5.7.15-1-MANJARO 
  Device-1: Realtek RTL8723AE PCIe Wireless Network Adapter 
  driver: rtl8723ae v: kernel port: 3000 bus ID: 01:00.0 chip ID: 10ec:8723 
  IF: wlp1s0 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: LG driver: r8169 v: kernel port: 2000 bus ID: 06:00.0 
  chip ID: 10ec:8168 
  IF: enp6s0 state: down mac: <filter> 
  WAN IP: <filter> 
  Local Storage: total: 253.39 GiB used: 12.63 GiB (5.0%) 
  SMART Message: Required tool smartctl not installed. Check --recommends 
  ID-1: /dev/sda vendor: Samsung model: MZMPC032HBCD-00000 size: 29.82 GiB 
  block size: physical: 512 B logical: 512 B speed: 6.0 Gb/s 
  serial: <filter> rev: 201Q scheme: GPT 
  ID-2: /dev/sdb vendor: Kingston model: SA400S37240G size: 223.57 GiB 
  block size: physical: 512 B logical: 512 B speed: 6.0 Gb/s 
  serial: <filter> rev: 0102 scheme: GPT 
  Message: No Optical or Floppy data was found. 
  Message: No RAID data was found. 
  ID-1: / raw size: 21.36 GiB size: 20.90 GiB (97.84%) 
  used: 12.63 GiB (60.4%) fs: ext4 dev: /dev/dm-0 label: N/A 
  uuid: 0d7b8949-703c-4981-afe0-0da33ed5aac8 
  ID-2: /boot/efi raw size: 300.0 MiB size: 299.4 MiB (99.80%) 
  used: 424 KiB (0.1%) fs: vfat dev: /dev/sda1 label: N/A uuid: EFE7-4361 
  Kernel: swappiness: 60 (default) cache pressure: 100 (default) 
  ID-1: swap-1 type: partition size: 8.15 GiB used: 0 KiB (0.0%) 
  priority: -2 dev: /dev/dm-1 label: N/A 
  uuid: bfc790f5-11e4-4e80-b6f7-a53bc3245fae 
  ID-1: /dev/sda2 size: 21.36 GiB fs: crypto_luks label: N/A 
  uuid: f479f34d-14df-480a-a896-df74249e2a00 
  ID-2: /dev/sda3 size: 8.16 GiB fs: crypto_luks label: N/A 
  uuid: a86edf33-7988-4e77-a4b6-85146a1fab66 
  ID-3: /dev/sdb1 size: 450.0 MiB fs: ntfs label: Recupera\xc3\xa7\xc3\xa3o 
  uuid: B606119B06115E25 
  ID-4: /dev/sdb2 size: 100.0 MiB fs: vfat label: N/A uuid: 7C12-EBC6 
  ID-5: /dev/sdb3 size: 16.0 MiB fs: <superuser/root required> label: N/A 
  uuid: N/A 
  ID-6: /dev/sdb4 size: 96.27 GiB fs: ntfs label: SISTEMA 
  uuid: 8E0618CB0618B5E5 
  ID-7: /dev/sdb5 size: 855.0 MiB fs: ntfs label: N/A uuid: B8D2A433D2A3F432 
  ID-8: /dev/sdb6 size: 125.91 GiB fs: ntfs label: BACKUP 
  uuid: 0AEEE9DCEEE9C055 
  Hub: 1-0:1 info: Full speed (or root) Hub ports: 3 rev: 2.0 
  speed: 480 Mb/s chip ID: 1d6b:0002 
  Hub: 1-1:2 info: Intel Integrated Rate Matching Hub ports: 6 rev: 2.0 
  speed: 480 Mb/s chip ID: 8087:0024 
  Device-1: 1-1.1:3 info: Silicon Motion type: Video driver: uvcvideo 
  interfaces: 2 rev: 2.0 speed: 480 Mb/s chip ID: 2232:1053 
  Hub: 2-0:1 info: Full speed (or root) Hub ports: 3 rev: 2.0 
  speed: 480 Mb/s chip ID: 1d6b:0002 
  Hub: 2-1:2 info: Intel Integrated Rate Matching Hub ports: 8 rev: 2.0 
  speed: 480 Mb/s chip ID: 8087:0024 
  Hub: 3-0:1 info: Full speed (or root) Hub ports: 4 rev: 2.0 
  speed: 480 Mb/s chip ID: 1d6b:0002 
  Device-1: 3-3:2 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 chip ID: 0bda:0129 serial: <filter> 
  Device-2: 3-4:3 info: Realtek RTL8723A Bluetooth type: Bluetooth 
  driver: btusb interfaces: 2 rev: 2.0 speed: 12 Mb/s chip ID: 0bda:8723 
  serial: <filter> 
  Hub: 4-0:1 info: Full speed (or root) Hub ports: 4 rev: 3.0 speed: 5 Gb/s 
  chip ID: 1d6b:0003 
  System Temperatures: cpu: 42.0 C mobo: N/A 
  Fan Speeds (RPM): N/A 
  Processes: 206 Uptime: 14m Init: systemd v: 245 Compilers: gcc: 10.1.0 
  Packages: pacman: 1155 lib: 375 flatpak: 0 Shell: Bash v: 5.0.18 
  running in: xfce4-terminal inxi: 3.1.05

I think you need the driver rtl8723au