Online-Tabellenkalkulation vs. Desktop: Was ist besser für grosse Daten?

Ten years ago, this was a simple question. Desktop spreadsheets (Excel, LibreOffice Calc) were for serious work. Online spreadsheets (Google Sheets) were for lightweight collaboration. If you had a lot of data, you used a desktop app. If you needed to share, you used Google Sheets.

Today the lines are blurred. Excel has a web version. Google Sheets is more powerful than ever. And a new category of tools — browser-based apps that process data locally — is challenging both approaches. The right choice now depends on a specific set of tradeoffs that most comparison articles gloss over.

This guide goes through the real differences, with concrete numbers, so you can make an informed decision based on your actual workflow.

How online spreadsheets actually work

When you use Google Sheets, here is what happens behind the scenes:

1. Your browser sends every keystroke and edit to Google's servers over the internet
2. Google's servers process the change, recalculate any affected formulas, and update the document
3. The server sends the updated state back to your browser (and every other browser viewing the file)
4. Your browser re-renders the visible portion of the spreadsheet

This round-trip happens for every single edit. It is what makes real-time collaboration possible — everyone sees changes instantly. But it also means your spreadsheet's performance depends on three things that have nothing to do with your data: your internet speed, Google's server load, and the number of concurrent editors.

Excel for the Web (Microsoft's online version) works similarly. Zoho Sheet, Airtable, and other online spreadsheets follow the same pattern.

How desktop spreadsheets actually work

When you use Excel or LibreOffice Calc on your desktop:

1. The file is loaded from disk into your computer's RAM
2. All formula calculations happen on your local CPU
3. Changes are saved to disk when you press Save
4. No internet connection is required at any point

This means performance scales directly with your hardware. A modern laptop with 16 GB of RAM and a fast SSD can handle Excel files that would bring Google Sheets to its knees. The tradeoff: no one else can see your changes until you email the file or upload it somewhere.

The performance gap, in numbers

Let us look at concrete performance benchmarks for the same operations across different tools and data sizes. These numbers are approximate and vary by hardware, but the relative differences are consistent:

The pattern is clear: online tools are 3-10x slower for computation-heavy operations, and they hit hard limits much sooner. The internet round-trip adds latency that compounds with every operation.

When online spreadsheets win

Despite the performance gap, online spreadsheets are the right choice in several scenarios:

Real-time collaboration

Nothing beats Google Sheets for live, multi-user editing. You can see cursors moving, changes appearing, and comments in real time. Excel's co-authoring feature (via OneDrive or SharePoint) comes close but still has sync delays and occasional merge conflicts.

If your primary need is three people building a budget spreadsheet together, Google Sheets is the best tool for the job, and performance is not an issue because shared budgets rarely have more than a few thousand rows.

Access from anywhere

Online spreadsheets work from any device with a browser. Open your phone on the train, make an edit, and it is saved immediately. You never worry about which version of the file is the latest, because there is only one version, and it lives in the cloud.

Simplicity for small data

For datasets under 10,000 rows, online spreadsheets perform well enough that the speed difference is imperceptible. If your data fits comfortably in this range, the convenience of cloud access and collaboration outweighs any theoretical performance advantage.

When desktop spreadsheets win

Large datasets

Any time your data exceeds 50,000 rows, a desktop application will provide a dramatically better experience. Formula recalculation, sorting, filtering, and scrolling are all faster by an order of magnitude. Excel can handle up to 1,048,576 rows — roughly 20x what Google Sheets can manage comfortably.

Complex formulas and macros

Excel's formula engine is more powerful than Google Sheets. Features like dynamic arrays, LAMBDA functions, Power Query, and VBA macros are either absent from Google Sheets or implemented with limited functionality. If your workflow depends on these features, Excel is the only realistic option.

Offline work

Desktop spreadsheets work without any internet connection. Google Sheets has an offline mode, but it is limited — it requires prior setup while online, does not support all features, and can have syncing issues when you reconnect.

Data privacy

When you use Google Sheets, your data lives on Google's servers. For many organizations, this is a compliance issue. Financial data, medical records, personally identifiable information, and other sensitive data may not be allowed on third-party cloud services under regulations like GDPR, HIPAA, or industry-specific policies. Desktop apps keep data on your machine.

The hybrid approach: Viztab

Viztab takes a different architectural approach. It runs in the browser like an online spreadsheet, but processes data entirely on your local machine, like a desktop app. Your files never leave your computer.

This gives it an unusual combination of properties:

• No install required. Open viztab.com/app and start working. Works on any OS with a modern browser.
• Desktop-class performance. Data processing happens in your browser's engine using local CPU and RAM, not on a remote server. No internet round-trips for calculations.
• No row limits. Viztab does not enforce the 1,048,576 row cap that Excel has or the 10 million cell limit in Google Sheets. It handles millions of rows.
• Complete privacy. Data is processed in the browser tab. Nothing is uploaded, nothing is stored remotely, and no account is needed.
• Works offline. Once the page loads, the app works without an internet connection. You can disconnect and continue working.

The tradeoff: Viztab does not support real-time collaboration. If you need multiple people editing the same spreadsheet simultaneously, Google Sheets or Excel with OneDrive co-authoring are still the right tools. Viztab is best for individual analysis work on large datasets.

Decision framework: which tool for which job

After comparing all three approaches, here is a practical decision guide:

The real answer: use more than one tool

Most data professionals do not pick one spreadsheet and use it for everything. A realistic workflow might look like this:

• Google Sheets for shared project trackers, team budgets, and collaborative planning documents. Anything where multiple people need to edit and the data is small.
• Excel for financial models with complex formulas, VBA automation, and pivot table analysis. Anything where formula power and feature depth matter.
• Viztab for opening and exploring large data files — the CSV export from your database, the 2-million-row analytics dump, the XLSX your client sent that crashes everything else. Anything where scale is the primary constraint.

Each tool has a domain where it is clearly the best choice. The key is recognizing which domain your current task falls into, rather than forcing one tool to do everything.

Häufig gestellte Fragen