It can be all kind of issues!
Network, do ya use adsl , broadband or fiber ? Via a VPN maybe ????
Any other devices at same network ?
Some background software running who use network ? Windows update , a torrent downloader ? ect ect
Anti virus busy in the background or optimizing tools ? Streaming software ?
Use a tool to make sure you set CPU cores as reserverd for Game and System to !
Latest system drivers installed ? Latest GPU driver installed ?
Make sure your fans and cool block from CPU / GPU / PSU are clean , so they dont block cooling from your system
(new patch uses CPU a lot more, so more heat <-- could throttle down your cpu or even gpu)
henche everything get hot without a good cooling / airflow !!!!!
With a "low end" cpu you need less resources to run , check for:
POWER PLAN ULTIMATE
How to disable unneeded services
Ingame max FPS settings
Nvidia/AMD gpu windows settings
Bios XMP/DOCP settings !
google for it !
Disconnect all unneeded hardware (only 1 mouse , 1 keyboard, 1 headset should be connected ->>> no game controlles, no usb drives, no cameras , no dac, ect ect ect)
Always try a cleanboot to make sure no other software is running in the background !!! test game with a WIRED connection
Post always a dxdiag so people can check and investigate if there is any issues (old drivers / software issues ect ect ect)
Cheers !