My understanding is that you have a wired serial solution.
Serially, I have a solution right now that sends a buffer size of 10,000 bytes.
I would think that there might be a simple solution using classic bluetooth with an HC05 on the Arduino and a BT dongle on the PC if it doesn't have built in classic bluetooth.
With your serial wired solution, what baud rate are you using, and what program is running on the PC side?
What range are you looking for? The HC12 is like BT classic and uses a simple SPP protocol and is longer range than an HC05.