> ## Documentation Index
> Fetch the complete documentation index at: https://docs.glidepathcpm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Performance Tips

> Best practices for large schedules and performance optimization

# Performance Tips

As your project grows to hundreds or thousands of tasks, GlidePath's performance remains responsive with these practices.

## Feature Spec Reference

**Module 15 — Performance & Reliability**

## Large Schedule Management (500+ Tasks)

### Best Practices

1. **Use Hierarchy Effectively**
   * Organize tasks in a logical WBS (2–4 levels deep)
   * Collapse parent summary tasks to reduce visible rows
   * Navigate using outline expand/collapse buttons

2. **Optimize Dependencies**
   * Avoid excessive linking; only link truly dependent tasks
   * Use summary-level dependencies instead of linking every task
   * Example: Instead of linking 20 tasks from Phase 1 to 20 tasks in Phase 2, link the Phase summary tasks

3. **Use Constraints Sparingly**
   * Constraints can slow CPM recalculation
   * Prefer dependencies over constraints when possible
   * Remove unnecessary constraints after schedule is finalized

4. **Zoom and Filter**
   * Zoom out (Month view) to see high-level overview without redraw lag
   * Filter task list to show subset (e.g., critical path only)
   * Navigate to specific date range instead of scrolling entire project

### Zoom Performance

* **Day zoom:** Slower, more detail; use for near-term (1–2 months)
* **Week zoom:** Good balance; standard view
* **Month zoom:** Fastest, high-level; use for overview

## CPM Recalculation

### When Recalculation Happens

CPM automatically recalculates when:

* Task duration changes
* Task date changes
* Constraint added/removed
* Dependency added/removed
* Calendar changes

### Optimizing Recalculation

1. **Batch Edits:** Make multiple changes before clicking outside, minimizing recalculations
2. **Turn Off Real-Time Calc** (if available): Recalculate manually after bulk changes
3. **Archive Completed Phases:** Move completed work out of active schedule
4. **Split Large Projects:** For 1000+ task schedules, consider splitting into sub-projects

## Calendar and Working Day Performance

* **Large holiday calendars:** More holidays = slower recalculation
* **Non-standard work weeks:** Custom calendars may impact performance
* **Simplify if needed:** Use default Mon–Fri calendar if possible; add specific holidays only

## Data Entry Best Practices

1. **Import over Manual Entry** — Importing 100 tasks is faster than creating them one by one
2. **Prepare Data First** — Get all task info ready before import to minimize back-and-forth edits
3. **Link Dependencies Last** — Create all tasks first, then add dependencies in bulk

## Export Performance

* Exporting large schedules (500+ tasks) may take 10–30 seconds
* Exporting to CSV is faster than PDF (PDF requires rendering)
* Use "Visible Tasks Only" export to reduce file size

## Accessibility Performance

* **Screen Readers:** Large Gantt charts may be slower with accessibility features enabled
* **Zoom to Detail Level Needed:** Don't run screen reader on entire 1000-task chart; zoom/filter first

***

## Troubleshooting Slowness

| Symptom                         | Cause                              | Solution                                      |
| ------------------------------- | ---------------------------------- | --------------------------------------------- |
| Gantt chart lags when scrolling | Too many tasks visible             | Collapse parent tasks or zoom out             |
| CPM recalculation slow          | Too many dependencies              | Remove unnecessary dependencies               |
| Page load slow                  | Large project                      | Archive old phases or split into sub-projects |
| Zoom slow                       | Day-level zoom with large schedule | Switch to Week or Month zoom                  |

***

## Next Steps

* [Keyboard Shortcuts Reference](/reference/03-keyboard-shortcuts)
* [FAQ](/reference/04-faq)