Internet speed tests work by sending and receiving data packets between your device and a server. Download speed measures how quickly you can pull data from the server, while upload speed measures how fast you can send data back. Ping represents the latency or delay, and jitter measures variation in that latency. TestFast uses optimized JavaScript-based methods to perform these calculations directly in your browser without external plugins or data storage. The process is quick, private, and effective.Internet speed tests work by sending and receiving data packets between your device and a server. Download speed measures how quickly you can pull data from the server, while upload speed measures how fast you can send data back. Ping represents the latency or delay, and jitter measures variation in that latency. TestFast uses optimized JavaScript-based methods to perform these calculations directly in your browser without external plugins or data storage. The process is quick, private, and effective.Internet speed tests work by sending and receiving data packets between your device and a server. Download speed measures how quickly you can pull data from the server, while upload speed measures how fast you can send data back. Ping represents the latency or delay, and jitter measures variation in that latency. TestFast uses optimized JavaScript-based methods to perform these calculations directly in your browser without external plugins or data storage. The process is quick, private, and effective.Internet speed tests work by sending and receiving data packets between your device and a server. Download speed measures how quickly you can pull data from the server, while upload speed measures how fast you can send data back. Ping represents the latency or delay, and jitter measures variation in that latency. TestFast uses optimized JavaScript-based methods to perform these calculations directly in your browser without external plugins or data storage. The process is quick, private, and effective.