We've seen this quite a bit after upgrades, especially with Sales and Inventory. In most cases, it's the PostgreSQL backend causing the slowdown. Things like missing indexes or slow queries are usually the culprits.

Feel free to DM me if you want to troubleshoot it together.

✅ 1. Review Server Specifications:

Ensure the server meets the minimum recommended specs:

• CPU: 4 cores minimum (8+ preferred for heavy usage)
• RAM: 8GB+ recommended
• Disk: SSD with high IOPS
• PostgreSQL: At least v13 or higher

✅ 2. Check Custom Modules:

Outdated custom modules from older versions can:

• Slow down views and reports
• Break lazy loading
• Cause inefficient SQL queries

Use the Odoo Profiler (Developer Tools > Performance) to identify bottlenecks.

✅ 3. Enable and Tune Caching:

Use ir.config_parameter to enable:

• QWeb caching
• Asset bundling
• DB and HTTP caching

Activate --workers in production (for WSGI multiprocessing) instead of using --dev mode.

✅ 4. Optimize PostgreSQL Configuration:

Fine-tune PostgreSQL using:

• work_mem = 64MB
• shared_buffers = 25%-40% of RAM
• effective_cache_size = 70%-80% of RAM
• Install pg_stat_statements to monitor heavy queries