# Performance improvement [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [What's new](Help%20System/GSTARCAD/2027/What's%20new/(What's%20new).md) GstarCAD 2026 has deeply optimized the performance of common operations, and the performance indexes of core operations have been greatly improved, specifically including: multi-reference drawing opening, extending/trimming, clipping blocks and external references, block editing and previewing, mirroring, and creating blocks, and other operations. ## Multi-Reference Drawing Opening Optimization Optimized the performance of opening drawings containing a large number of external reference drawings, and solves the problem of lagging or timeout in the opening of some drawings. ## Extending (Fence, Crossing) optimization Extending performance in Fence and Crossing mode has been improved by more than 4.5 times on average compared to the previous version. ## Trimming (Fence, Crossing) optimization Trimming performance in Fence and Crossing mode has been improved by more than 1x on average compared to the previous version. ## Clipped blocks and external references optimization Drawings that include clipped blocks or external references have an average opening performance improvement of about 200% relative to pre-optimization, and a switching layout performance improvement of about 315%. ![](Help%20System/GSTARCAD/2027/assets/c775ff321b73a737cc3980763bd5900d7d1c7dc5412b708bbf55ebb19fde3846.png)The percentage of improvement is related to the size and amount of clipped data included. ## Block Editing Preview optimization Improved the block preview speed of related commands (e.g. BEDIT/REFEDIT/INSERT etc. commands), solved the problem of oversized block preview lagging, and improved 6 times compared with the previous version. ## Mirror Mirror operation performance is improved by about 40% compared to the previous version. ## Creating Block No stuck and unresponsive issues when creating block objects containing a large number of multiple leaders; ~4x performance improvement for creating block objects containing a large number of large-coordinate entities; ~4x performance improvement for exploding inserted block objects. ## Hatch The point selection and hatch performance for complex drawings has been improved by over 30 times. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/GstarCAD2026NEW/GUG_NewFunction2026_Performanceimprovement.html) · © Gstarsoft Co., Ltd.