Although Windows 10 often includes "generic" drivers that allow devices to function immediately, they may not offer the best performance. Installing the dedicated Realtek driver ensures:
Unlocks the full 150 Mbps potential of the hardware. Although Windows 10 often includes "generic" drivers that
Reduces the frequency of "Limited Connectivity" errors or sudden disconnections. Finding the right Realtek RTL8188CE Wireless LAN 802
Finding the right Realtek RTL8188CE Wireless LAN 802.11n PCI-E NIC driver for Windows 10 - Amazon
If you find that your speeds are still lagging, ensure your router is broadcasting on a clear 2.4GHz channel, as this card does not support the 5GHz band used by newer 802.11ac or AX (Wi-Fi 6) standards.
It supports data transmission speeds of up to 150 Mbps on the 2.4G frequency band.
Mrisata PCIe WiFi Card 150Mbps 802.11 B/G/N MINI ... - Amazon.com