Why Does My Espresso Shot Run Too Slow?
Shots taking 40+ seconds with barely any output create bitter, over-extracted espresso that's harsh and undrinkable.
⚡ Quick Answer
Slow or choked shots (40+ seconds) indicate excessive puck resistance. Grind coarser by 1-2 settings, reduce dose by 1-2 grams, or check for overly hard tamping. If machine barely produces output, you may have ground too fine and need to purge the grinder and start coarser.
🎯 Key Takeaway: Slow shots = too much resistance. Water can't flow through the puck. Make it easier for water to pass by grinding coarser or using less coffee.
5 Causes of Slow-Running Espresso Shots
1. Grind Is Too Fine (Primary Cause)
Fine particles pack tightly and block water flow. The puck becomes impermeable, forcing the machine to struggle or choke completely.
✅ Solution: Grind coarser by 1-2 settings. Target 25-30 seconds. If you went too fine and choked the machine, purge the grinder of fines and start fresh.
2. Coffee Dose Is Too High
Over-dosing compresses the puck against the shower screen, creating back pressure that slows extraction dramatically.
✅ Solution: Reduce dose by 1-2 grams. Standard double basket takes 18g comfortably. Check for screw imprints on the puck after extraction (sign of over-dosing).
3. Tamping Too Hard or Uneven
Excessive tamping pressure compresses the puck excessively. The outdated "30 lbs of pressure" rule causes many choked shots.
✅ Solution: Tamp with light to medium pressure—just enough to level the puck. Consistency matters more than force. Levelness matters more than pressure.
4. Coffee Is Too Fresh (High CO2)
Very fresh beans (under 5 days) release CO2 during extraction, creating bubbles that block water flow and slow the shot.
✅ Solution: Rest fresh-roasted beans 7-14 days before use. Light roasts may need 10-21 days. Fresh coffee needs coarser grind settings.
5. Machine Pressure Is Too Low
Insufficient pump pressure (under 6 bar) cannot push water through even a properly prepared puck, making normal grinds seem too fine.
✅ Solution: Check pump pressure with gauge. Target 8-9 bar. Descale machine if pressure dropped suddenly. Older machines may need pump replacement.
Choked Shot Emergency Recovery
If your machine is completely choked (no output after 10+ seconds):
- 1. Stop the shot immediately — Don't let the pump struggle
- 2. Remove the portafilter carefully — Pressure may be built up
- 3. Purge your grinder — Run 5-10g of beans through to clear fines
- 4. Go 3-5 settings coarser — Reset to known working range
- 5. Reduce dose by 1g — Give the puck more headspace
- 6. Pull a test shot — Don't adjust further until you get flow