200,000 images in single folder in linux, performance issue or not?

I have a php/mysql website with over 200,000 images in single folder (linux server). I don't think, that I will never need to see them in file explorer, instead they will be viewed on website on their individual pages. They are just displayed in product page on website. File system is ext3. so is it wise to save them in single folder? can it slow down the site's performance?