I just moved my website to Wordpress from another service. Unfortunately, this means that although I was able to import all of my previous content to Wordpress, the post permalinks are now entirely different.
Unfortunately, I can't simply change the structure of the permalinks in Wordpress because the old permalinks from the old website contain a random number in part of the permalink, so it's impossible to reliably reproduce the link.
My only option is to create 301 redirects to each article. That's no problem because I've also used a script to record and match the old permalink to the new permalink and they are all sitting in a text file.
My question is though, will having almost 1000 redirects in the .htaccess file significantly slow performance of the page overall?