SVGRenderStyle should be held as a DataRef and shared/lazily allocated The attached patch does just that.
Created attachment 4957 [details] Makes SVGRenderStyle a DataRef pointer (thus shared, COW)
Comment on attachment 4957 [details] Makes SVGRenderStyle a DataRef pointer (thus shared, COW) mjs, darin, dethbakin or hyatt could easily review this simple patch.
Comment on attachment 4957 [details] Makes SVGRenderStyle a DataRef pointer (thus shared, COW) looks fine, r=me