Protect a useful baseline
Back up the world and note the launcher profile you use to open it. Write down the current mod list and choose one familiar activity to repeat after installation, such as collecting experience at a particular farm.
Keep the first change small
Check the Clumps download against the profile's game version and loader. Close the game before editing the instance's mods folder. Avoid updating other mods during this first check so any change in startup behavior is easier to investigate.
Repeat the same activity
Use the same farm, player position and approximate session length for your comparison. Record what you observe rather than guessing at a percentage improvement. If the experience feels unchanged, retain that result too. Different worlds have different workloads, and a quiet area may offer little opportunity to notice a change. Keep the old jar and your backup until you are satisfied with the setup.
Next step: read the installation guide or find a matching download.
Project reference: Official Clumps project and file details.