Does Illustrator's Symbol Sprayer cache symbol instances or allocate new objects per spray event?

Allocation Logic

Adobe Illustrator's Symbol Sprayer does not utilize an internal instance cache to reuse objects; instead, it allocates a new symbol instance object for every single spray event. Each click or drag action with the tool generates discrete instances that are added to the document's object hierarchy.

Analysis of Memory Growth

The incremental memory growth observed when spraying thousands of instances is the expected result of this allocation strategy. Because each instance is a unique object, the document's memory footprint increases proportionally to the number of symbols placed.

Contributing Factors

• Undo History: Illustrator retains these instances in the undo stack. Memory is typically not released until the undo history is cleared or the document is closed.
• Instance Overhead: While a symbol instance is more lightweight than a unique group of paths, it still requires memory for its specific transform data (position, rotation, scale).
• Garbage Collection: Internal memory management may mask immediate spikes, but the cumulative growth is tied to the total object count in the active workspace.

Verification Steps

To confirm this behavior in your specific version of Illustrator (tested on CC 2018–2024), follow these steps:

1. Open a blank document and create a simple symbol.
2. Open your OS memory monitor (Activity Monitor on macOS or Task Manager on Windows).
3. Use the Symbol Sprayer to create a large volume of instances (e.g., 5,000). Observe the steady climb in private memory usage.
4. Perform a series of Undo commands (Ctrl/Cmd + Z). A corresponding drop in memory usage confirms that discrete objects are being removed from the heap.

Diagnostic Detail Needed: Are the symbols being sprayed complex assets containing embedded raster effects? This would significantly increase the per-instance memory overhead compared to simple vector symbols.