Programming :: How To Improve Sed Script To Split File

If there's another way to improve a script that I have created, since I'm not an expert! It works, and it made what I wanted, but it took a while to do it... maybe it can be improved. Here's the background. I have one file, with 244000 lines, let's call it X. I needed to split it in 1000 files, each one of 244 lines. I also needed the files to have the .arp extension. So here is what I did:

Code:
for i in {1..1000}
do
sed -n '1,244p;244q' X > $i.arp
sed -i '1,244d;' X # in this way I deleted the copied lines each time
done