Slow WiFi can be caused by many factors. The common culprits behind a lagging WiFi connection include too many devices connecting to one channel, users doing bandwidth-heavy activities, the way your router is positioned, and outdated hardware and drivers. https://testmyinternetspeed.org/ is the most accurate way for Wifi Speed Test.

1. WiFi Speed Test
Best Online Tool for WiFi Speed Test

2. Introduction
In general, the performance experience of different WiFi
terminal devices in the same wireless network environment is
different. There are many factors that affect the WiFi speed.
• 21 factors affecting your wifi speed
• 10 best wireless routers for gaming 2018
• Best Travel Router Under $250 For 2018
• Top 6 wifi mesh network system 2017
• World’s first 802.11ax router, ASUS RT-AX88U
• How to choose a 4G LTE Router

3. Good WiFi Speed
A good Internet speed is typically over 20 to 25 Mbps download
and perhaps 5 Mbps upload.
A good WiFi speed is generally over 100 Mbps instantaneous but
can be significantly higher especially on 5 GHz. WiFi and
Internet are two different things.
Wireless Internet means connecting to the ISP by wireless such
as using a cellular network connection or a Satellite ISP
service.

4. Why is the WiFi Speed Slow?
This interference can cause a number of problems:
Dropped signals: Occasionally, Wi-Fi will lose the signal and have
to reacquire it. This may not be a big deal for daily browsing
or even streaming video (which gets buffered on the local
device), because the re-acquisition happens quickly. But if you
play online games, it can get pretty irritating.
Higher latency: Increased interference can mean higher latency,
which can be a problem for all the reasons we outlined in the
previous section.
Lowered speeds: More interference also means lower signal
quality, which results in lower connection speeds.

5. How can I increase my WiFi speed?
• Switch the Access Point / Router to a less crowded channel. Avoiding
interference is often the best you can do without spending money.
• Use a directional antenna.
• Upgrade from 802.11b/g to 802.11n or better
• Prefer 5GHz channels over 2.4GHz channels. (This is also avoiding
interference.)
• Connect some devices via ethernet if they are close enough to your Router
or you can stretch ethernet cable.
• Have more than one Access Point on different channels and distribute
which devices connect to which Access Point. If you can stretch ethernet
spread out those access points.
• Put some devices of PowerLine Networking (HomePlug AV) to free up WiFi
bandwidth.

6. What is WiFi Speed Test
Wi-Fi refers to the widely used wireless networking technology
that makes use of the radio waves to offer access to the high-
speed wireless Internet and network connections. To measure
the speed you can conduct the WiFi Speed Test at
testmyinternetspeed.org for your network connection.
Further WiFi is a registered trademark term as per IEEE
802.11x standards. However, you may find that the term WiFi
is often given the full form as Wireless fidelity.