Which IDE extension is actually the smoothest for using DeepSeek-V2 right now because I am seriously torn between setting up Continue or just sticking with something like Codeium?

I am currently trying to finish up a custom Python-based inventory tracker for my uncles small warehouse business back in Ohio before the holiday rush starts next month and I really need reliable autocomplete that wont lag my system to death. I have a pretty old ThinkPad so I cant really run local LLMs and need to use the DeepSeek API to save some cash compared to the $20 a month for Copilot. I'm trying to keep my total spend under $10 for the whole project.

Continue seems really powerful because it lets me customize the system prompts and I like the open source vibe but I have heard it can be a bit glitchy with the chat window sometimes or lose connection to the API. On the other hand I saw some people mentioning Roo Code or even just a generic tab-complete wrapper. I am mostly doing backend logic and some messy SQL queries that need a lot of context to get right.

Does anyone have experience with which one handles the long context better or which has the fastest response time when using the DeepSeek-V2 coder model specifically? Just trying to find that sweet spot between cost and performance before I commit to one for this project...