The real drag in Excel isn't a single thing. It's the unholy trinity of slow formulas, bloated files, and too much data, and they feed on each other. When a logistician asks which annoyance hurts most, the honest answer is that picking one is like asking a commuter whether traffic, construction, or a flat tire is the bigger problem. They all compound, and they all waste time.
We've seen this pattern across industries. A spreadsheet starts lean. Then someone adds a lookup that references another workbook. Then a few thousand rows become a few hundred thousand. Conditional formatting layers on. The file grows from a manageable 2 MB to a sluggish 50 MB. Now every cell edit triggers a recalculation that freezes the interface for seconds. Users don't just wait for formulas, they wait for the whole machine to catch up. Crashes become routine. Work gets done in spite of the tool, not because of it. That's not a user problem. That's a design problem baked into a tool that was never built for modern scale.
What's telling is that the person who posted on Reddit works in logistics, where data volume and calculation speed are non-negotiable. Inventory tables, shipment schedules, cost projections, these aren't academic exercises. A 10-second lag on a pivot table refresh can mean a missed deadline or a wrong order. The question "slow formulas, too much data, or file size?" reveals a deeper truth: Excel forces users to choose which pain to accept. You can have accurate data, or you can have fast performance, but rarely both. That trade-off is the real bottleneck.
The practical takeaway is this: the problem isn't you or your data. It's that spreadsheets treat all cells equally, whether they're a static label or a volatile array formula. The fix isn't more efficient workarounds or cleaner files. It's a fundamentally different approach, one where calculations happen only when needed, where data lives outside the grid, and where performance doesn't degrade as you add rows. Until that becomes the norm, every logistician, analyst, and planner will keep wrestling the same three enemies in different combinations. The question isn't which one hurts most. It's why we're still fighting them at all.