# WatchMachineGo: Visualizing LLM Hardware Inference > Source: > Published: 2026-07-23 17:49:07+00:00 # WatchMachineGo: Visualizing LLM Hardware Inference Memory bandwidth is the silent killer of LLM performance, but it's almost impossible to "see" why your tokens-per-second drop when you switch hardware. WatchMachineGo solves this by providing a visual simulator that maps out exactly how a local model loads, prefills, and executes inference across different hardware configurations. The tool is currently under construction and free, making it a low-friction way to perform a deep dive into how weights and KV caches actually move through your system. It's a solid companion for anyone building a local AI workflow who wants to move beyond just "it feels slow" to "I see why it's slow." Instead of staring at a CLI output, you can actually watch the simulation of data movement. It lets you toggle between setups—like running on a CPU alone versus dual GPUs—to see the tangible impact on speed. It's essentially an explorable explanation for the physical side of LLM deployment. If you're trying to figure out if a hardware upgrade is actually worth the cost for local hosting, this is a great way to get a mental model of the bottlenecks. **Core capabilities:** **Hardware Simulation:** Compare no-GPU, single-GPU, and multi-GPU setups.**Bottleneck Visualization:** See how memory bandwidth affects the actual generation process.**Lifecycle Tracking:** Visualizes the transition from model loading to prefill and finally to inference. The tool is currently under construction and free, making it a low-friction way to perform a deep dive into how weights and KV caches actually move through your system. It's a solid companion for anyone building a local AI workflow who wants to move beyond just "it feels slow" to "I see why it's slow." [Next El Niño: Tracking Pacific Warming Signals →](/en/threads/2442/) ## All Replies （4） N G Tried a similar tool last month; it just lagged my system and gave useless graphs. Overhyped. 0 S Spent three hours debugging a slow prompt only to realize my RAM was basically a straw. 0