The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →JDK 26 introduces two performance changes with different goals: JEP 522 reduces synchronization between application and garbage-collection threads in G1 to target higher application throughput, while JEP 516 extends ahead-of-time (AOT) object caching to any garbage collector, including ZGC, to support faster JVM startup and warmup. Oracle’s published materials describe these outcomes qualitatively; they do not establish a universal speedup percentage.
Oracle’s JDK 26 release notes are dated 17 March 2026. Oracle JDK 26 Release Notes
What changes in JDK 26 performance?
| Change | Subsystem and scope | Intended performance outcome |
|---|---|---|
| JEP 522: G1 GC throughput improvements | Reduces synchronization between application threads and GC threads when using G1. | Increased application throughput. |
| JEP 516: AOT object caching with any GC | Extends AOT object-cache compatibility to any garbage collector, including ZGC. | Improved JVM startup and warmup. |
The changes address different concerns: JEP 522 targets throughput while an application is running with G1; JEP 516 targets startup and warmup by making cached objects usable across collectors. Oracle’s JDK 26 migration guide describes both changes.
How does JEP 522 improve G1 throughput?
G1 performs garbage collection alongside application work. JEP 522, “G1 GC: Improve Throughput by Reducing Synchronization,” reduces synchronization between application threads and garbage-collection threads. Oracle states the aim is increased application throughput.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
This is specifically a G1 change; it should not be presented as a general improvement to every collector in JDK 26. The official release and migration materials describe the intended outcome but do not provide a percentage applicable across workloads, hardware, or heap configurations. Whether a particular application benefits, and by how much, must be established with measurements in its own environment. Oracle’s release notes
What does JEP 516 change about AOT object caching?
JEP 516 makes the ahead-of-time object cache work with any garbage collector, including ZGC. In the migration guide’s description, cached Java objects are loaded sequentially from a neutral, garbage-collector-agnostic format rather than memory-mapped in a collector-specific format. The goal is to improve JVM startup and warmup.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
The feature builds on Project Leyden’s AOT work. OpenJDK lists JEP 516 as delivered in JDK 26 and describes Leyden’s goals as improving startup time, time to peak performance, and footprint. Those are project goals, not a promise that every application will improve in all three areas. OpenJDK Project Leyden
Default behavior and disabling the cache
Oracle’s JDK 26 release notes say the AOT cache is enabled by default and document -XX:-UseGCOverheadLimit as the option to disable it. The same notes caution that exact out-of-memory error trigger conditions may differ because G1 calculates GC overhead and free heap somewhat differently. Consult the release notes for your JDK distribution and test the configuration you deploy before relying on particular OOME behavior. Oracle JDK 26 Release Notes
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
How should you evaluate these changes?
- Identify the relevant path. If the application uses G1 and its concern is throughput, evaluate JEP 522. If JVM startup or warmup is the concern, evaluate AOT caching with the collector you actually use.
- Compare equivalent runs. Use the same workload, collector, heap and JVM settings, startup profile, and environment for the JDK versions being compared.
- Measure the outcome that matters. Assess application throughput for the G1 change, and startup or warmup behavior for AOT caching. Do not infer one metric from the other.
- Validate deployment behavior. Check the JDK distribution’s release notes and verify the AOT-cache and out-of-memory behavior in the configuration you intend to ship.
The official JDK 26 release notes and migration guide do not give a representative benchmark result tied to named hardware and workload, so they support no general numerical claim for either change. Treat gains as application- and configuration-dependent, and make performance claims only from measurements of the relevant workload. Oracle JDK 26 migration guide
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
