My fortnite jerks a lot despite a good PC, what should I do? Here you can see it
Please define what is in your "good" PC hardware.
Your PC is far from good. Nen outdated dual-core and ne 750ti, no wonder if it jerky. Put on 720p. Then it may be running.
To put an FX processor in a set with a good PC at the same time is real… Funny xD An "AMD Athlon (tm) 64 Dual Core Processor 4800+" not only has a good deal of what to do with a good PC xDD
And your graphics card is only enough for a booklet at most. Buy a 1050 Ti, which is 73% faster: https://gpu.userbenchmark.com/...2187vs3649
An AMD Athlon (tm) 64 Dual Core Processor 4800+ and GTX 750 Ti as per video description.
Here's a comparison with an Athlon 200GE and your CPU: https://cpu.userbenchmark.com/...6vsm592714
As you can see. Buy something better.