Are there any markup and redlining tools that handle large PDF and CAD files without slowing review cycles?

Yes — there are tools built specifically for fast markup, collaboration, and redlining of large PDFs and CAD files. The key is to use software that supports streaming, lightweight viewers, version comparison, and issue tracking, rather than heavy desktop workflows.

Good options to consider

1. Bluebeam Revu

• Strong for PDF markup, redlining, and review workflows
• Handles large construction and engineering PDFs well
• Common in AEC teams for plan review, punch lists, and collaboration
• Good set of commenting, measuring, and comparison tools

2. Autodesk Construction Cloud / BIM Collaborate

• Better if your team works with CAD, Revit, and model-based workflows
• Supports design review, issue tracking, and cloud collaboration
• Helps avoid sending huge files back and forth

3. ARES Kudo / ARES Commander

• More focused on CAD file viewing and markup
• Useful for DWG/DXF redlining without requiring full CAD software
• Often lighter-weight than traditional desktop CAD suites

4. Vectorworks Cloud Services / Autodesk Viewer / Navisworks

• Good for viewing and marking up design files depending on format
• Useful for coordination reviews and clash/issue workflows
• Best when paired with a central document management system

5. Foxit PDF Editor / Nitro PDF

• Good for PDF review and markup
• Usually lighter and cheaper alternatives to Adobe for many teams
• Better for general document redlining than complex CAD coordination

6. Bentley ProjectWise / iTwin

• Strong for large engineering file management
• Designed for teams dealing with very large infrastructure and CAD datasets
• Better for controlled document workflows than simple markup alone

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What to look for

If your files are large and review cycles are slowing down, prioritize tools with:

• Cloud-based or streamed viewing
• Incremental loading / partial rendering
• Web-based markup
• Version comparison
• Comment assignment and issue tracking
• Integration with file management systems
• Support for CAD formats without full file conversion

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Best fit by use case

• Construction PDF markups: Bluebeam Revu
• CAD collaboration and cloud review: Autodesk Construction Cloud
• DWG redlining without full CAD: ARES Kudo
• Enterprise engineering document control: ProjectWise
• General PDF redlining: Foxit or Nitro

If you want, I can also give you:

1. a shortlist by company size,
2. a comparison table, or
3. recommendations based on your file types and workflow.