Many games, including this one, require comparatively speedy hardware before the keyboard's input can be properly detected. Game controllers do not have any bearing on the slowness (nor vice versa) of the overall hardware.
Plants vs. Zombies: GW2
MINIMUM
OS: Windows 7 64-bit/ Windows 8.1 64-bit/ Windows 10 64-bit
CPU: 3.20 GHz Intel i5 650/ 2.5 GHz AMD Phenom X4 9850
RAM: At least 4GB for Windows 7/ Windows 8.1/ Windows 10
Hard Drive: 20 GB
Video: NVIDIA GeForce GT 640/ AMD Radeon HD 5750 (driver conflicts)
DirectX: 11
Input: Keyboard and Mouse, Analogue Controller
Online Connection Requirements: 192 KBPS or faster internet connection
RECOMMENDED
OS: 64-bit Windows 10 or later
CPU: Intel i5 6600 or equivalent
RAM: At least 16GB RAM
Hard Drive: 40 GB
Video: NVIDIA GeForce GTX 970 4GB / AMD Radeon R9 290 4GB
DirectX: 11.1 Compatible video card or equivalent
Input: Keyboard and Mouse, Analogue Controller
Online Connection Requirements: 512 KBPS or faster internet connection
