I'm about to lose my onlysource of income

For context: I recently completed university and I'm a software developer. I'm having a tough time finding work so I'm freelancing. I got a client, I'm developing a website for him and it's going good. It's only been 1 month.

The only problem is my laptop. It's so slow and outdated. I can barely put it a solid 4 hours of work before it starts complaining about multiple things. The main issue is space and speed.

I'm worried that I won't be able to meet deadlines and I will be replaced. Can someone please help me with something, anything.