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Server 2025 vs. Server 2022 Disk Performance Comparison
Windows Server 2025 was announced on January 26, 2024 and it is now available as a public preview version. The purpose of this review is to compare the performance of the newly released Windows Server 2025 to the performance of Windows Server 2022 for a variety of different disk analysis, file classification, duplicate files search, file search, file compression, file synchronization and file management operations. For this review, we have used an off-the-shelf server with a 12-core Intel CPU, 16 GB of system memory and a fast NVMe SSD disk. The first time, all the tests were performed on a freshly installed and fully updated version of the Windows Server 2022 operating system. The second time, all the tests were performed on a freshly installed and fully updated version of the newly released Windows Server 2025 operating system. Both times the testes were performed in the same order using exactly the same data set containing 450,000 small files with the average file size 32 KB, 50,000 medium-sized files with the average file size 4 MB and 1,000 large files with the average file size 100 MB. The performance tests were performed using the DiskBoss file management solution, which is capable of performing many different types of disk space analysis, file classification, file search, file synchronization and file management operations using multiple, parallel threads fully utilizing modern multi-core CPUs. For this review, we have performed the following benchmarks:
According to the disk space analysis benchmark results, the performance of Windows Server 2022 reached up to 128,000 Files/Sec with 4 parallel disk space analysis threads, while the performance of Windows Server 2025 reached up to 156,000 Files/Sec, which represents a significant 17% improvement for this specific operation. 
According to the file classification benchmark results, the performance of Windows Server 2022 reached up to 73,000 Files/Sec with 4 parallel file classification threads, while the performance of Windows Server 2025 reached up to of 82,000 Files/Sec, which represents an 11% improvement for this specific operation. 
The duplicate files search operation is a very CPU intensive and I/O intensive operation, which requires a fast multi-core CPU, fast directory parsing capabilities and scalable file read operations allowing to read data from multiple files at the same time. According to the duplicate files search benchmark results, the performance of Windows Server 2022 reached up to 6,400 Files/Sec with 4 parallel search threads, while the performance of Windows Server 2025 reached up to 5,900 Files/Sec, which represents a performance degradation of 7.5% for this specific operation. 
The file search operations requires both fast directory parsing capabilities and scalable file read operations allowing to read data from multiple files at the same time. According to the file search benchmark results, the performance of Windows Server 2025 reached up to 25,900 Files/Sec with 4 parallel file search threads, while the performance Windows Server 2025 reached up to of 32,900 Files/Sec, which again represents a significant 21% improvement for this specific operation. 
The file compression operation is a very CPU intensive and I/O intensive operation, which requires a fast multi-core CPU, fast directory parsing capabilities and scalable file read operations allowing to read data from multiple files at the same time. According to the file compression benchmark results, the performance of Windows Server 2022 reached up to 3,100 Files/Sec with 4 parallel search threads, while the performance of Windows Server 2025 reached up to 2,700 Files/Sec, which represents 12% performance degradation for this specific operation. 
The file and directory comparison operation is a CPU intensive and I/O intensive operation, which requires a fast multi-core CPU, fast directory parsing capabilities and scalable file read operations allowing to read data from multiple files at the same time. According to the file comparison benchmark results, the performance of Windows Server 2022 reached up to 10,400 Files/Sec with 4 parallel search threads, while the performance of Windows Server 2025 reached up to 10,700 Files/Sec, which represents a small 2.7 performance improvement for this specific operation. 
The file synchronization operation is an I/O intensive operation, which requires scalable file operations allowing to read and write data from/to multiple files at the same time. According to the file synchronization benchmark results, the performance of Windows Server 2022 reached up to 9,300 Files/Sec with 4 parallel file synchronization threads, while the performance of Windows Server 2025 reached up to 9,500 Files/Sec, which represents a small 2.9% improvement for this specific operation. 
The file delete operation requires both fast directory parsing capabilities and scalable file delete operations allowing to delete multiple files at the same time. According to the file delete benchmark results, the performance of Windows Server 2022 reached up to 37,900 Files/Sec with 4 parallel file delete threads, while the performance of Windows Server 2025 reached up to of 36,400 Files/Sec, which represents a small 3.9 percent performance degradation for this specific operation. 
In order to summarize the performance comparison review, we have averaged the performance differences between the newly released Windows Server 2025 and Server 2022 for all performed benchmarks and according to the average results the performance of Windows Server 2025 is better by 3.92%. 
* This review was prepared for information purposes only and we strongly recommend to test the performance of DiskBoss file management operations on your specific hardware platform and with your specific data sets.
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