QB Issue Resolution:

Assuming no reports and/or snapshot is open, resort all lists and run file>utilities>verify data and rebuild data.

Resolution for Issue 'How do I stop the ‘working report’ each time I enter something. This just started and it adds 3 min to entry process that takes 15 seconds?' available: Yes (Solved).
Source: Intuit Community forum.

How do I stop the ‘working report’ each time I enter something. This just started and it adds 3 min to entry process that takes 15 seconds?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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