Must you drill smooth holes? You might use glass. You might use ceramic. You might use porcelain. You might use stone. You might use tile. You might use gemstones. Normal drill bits break weak things. Instead, pick a diamond drill bit. Tiny diamond bits cover it.
You strictly need diamond drill bits for porcelain tile. Standard masonry bits break fast on hard tile. Very dense tile creates extreme heat. This heat causes fast surface cracking. Choosing the right bit protects your wall tile. Use proper drill speeds now.