Here is a composed list of mods that are client side only and are for some reason included with the Dev Server Builds, removing these mods can free up some resources on servers and just generally help in the long run.

• Better Advancements
• Client Tweaks
• Controlling
• CTM (Connected Textures Mod)
• Custom Main Menu
• Dynamistics
• ikwid (I Know What I'm Doing)
• Mod Name Tooltip
• More Overlays
• Mouse Tweaks
• No Recipe Book
• Resource Loader
• Tip The Scales
• Toast Control
• Reauth

Also the mod Bed Patch can be removed as it's included in the VanillaFix mod.

If removed it should be removed from both client and server builds