View a comprehensive history of all the performance optimisations in Construct 3 since the first release.

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C3 runtime: constant event variables now directly insert their value to compiled expressions instead of calling a getter function
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C3 runtime: small optimisation for running some object actions
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C3 runtime: optimise system/single-global conditions and actions
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C3 runtime: fix performance regression in destroying instances
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C3 runtime: new expression compiler to accelerate expression evaluation (+20-50% performance for intensive projects)
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Reduce the number of network requests when loading Google Drive file list
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Small GPU performance improvement to effects rendering in editor
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Improve the responsiveness of Cloud Save by caching cloud meta data for the length of the session (can be disabled in settings)
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Improved Layout View rendering performance, especially for Firefox and Safari
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WebM Opus encoder now uses WebAssembly, which is faster and a smaller download
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New renderer for data editor, can now render much larger data sets
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Improved Opus decoder warm up time when loading sounds on the fly
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Optimised general rendering performance in the Layout View
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Significantly improved tilemap rendering performance in the editor
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Make it faster to open projects with thousands of instances
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Runtime Opus decoder is now faster, uses less memory, and uses WebAssembly where supported
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Improve creation speed of the table control
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Lower the memory footprint of the Animations Editor
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Improve spritesheeting algorithm to avoid significantly increased memory usage in a specific worst-case scenario
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Improve performance of sliding panels in the Animations Editor