Filtering by 'Resource type' and selecting 'Virtual Machines' directly shows costs related to VMs. Other filters may include unrelated resources or miss some VMs.
Using resource tags allows cost grouping and filtering by department within the same subscription. Separate subscriptions isolate costs but add management overhead.
The 'Cost Management Reader' role grants read access to cost data without allowing changes to resources. Other roles provide broader or unrelated permissions.
Aggregating by tags and limiting time range reduces data volume and improves report speed and readability. Exporting data is useful but not a direct improvement in Cost Analysis tool performance.
Reviewing cost by resource during the spike period helps identify which resource or service caused the increase. Other options are either risky or unproductive first steps.