Stress test

I stress tested the code with large `.bib` files. I already did that before with a ~300KB file, but this time I tried much larger files.

## Method
I couldn't find a BibTeX file with 1GB of data so I downloaded [this](https://shelah.logic.at/v1/listb.bib) file. After that, I wrote a [script](https://ideone.com/G53WKF) that makes another copy of the file and then starts duplicating its contents over and over again until it reaches a certain size that I specify.

## Machine specs
- **Processor**: `Intel Core i5-10210U (1.60GHz × 8)`
- **RAM**: `16GB`
- **Disk**: `240GB SSD`
- **OS**: `Ubuntu 20.04 64-bit`

### Results
After adjusting the size parameter and observing what happens to the plugin when I execute the main command, I came up with the following conclusions:
- If the size is above `512MB` (about equivalent to `536870912 Bytes`, which is about equivalent to `0x1FFFFFE8 Bytes` in Hexadecimal), nothing happens for one or two seconds then the below alert appears:
- If the size is below `512MB`, nothing happens for about 20 seconds or so, then the call stack will not afford that much data and will throw an error like this:
- If the size `<= 12MB` (which accounts for about `40,000` references), the plugin works fine and there are no issues at all.