When a virtual warehouse in Snowflake is resized, specifically when it is increased in size, the additional compute resources become immediately available to all running and queued queries. This means that the performance of these queries can improve due to the increased resources. Conversely, when the size of a warehouse is reduced, the compute resources are not removed until they are no longer being used by any current operations1.
References:
[COF-C02] SnowPro Core Certification Exam Study Guide
Snowflake Documentation on Virtual Warehouses2
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