perf: speed up cell rendering

src/js/core/cell/Cell.js

@@ -98,36 +98,37 @@ export default class Cell extends CoreFeature{
 
 	//generate cell contents
 	_generateContents(){
-		var val;
-
-		val = this.chain("cell-format", this, null, () => {
-			return this.element.innerHTML = this.value;
+		const val = this.chain("cell-format", this, null, () => {
+			return this.value;
 		});
 
 		switch(typeof val){
 			case "object":
 				if(val instanceof Node){
 
 					//clear previous cell contents
-					while(this.element.firstChild) this.element.removeChild(this.element.firstChild);
-
+					this._clearCellContent();
 					this.element.appendChild(val);
 				}else{
-					this.element.innerHTML = "";
+					this._clearCellContent();
 
 					if(val != null){
 						console.warn("Format Error - Formatter has returned a type of object, the only valid formatter object return is an instance of Node, the formatter returned:", val);
 					}
 				}
 				break;
 			case "undefined":
-				this.element.innerHTML = "";
+				this._clearCellContent();
 				break;
 			default:
 				this.element.innerHTML = val;
 		}
 	}
 
+	_clearCellContent(){
+		while(this.element.firstChild) this.element.removeChild(this.element.firstChild);
+	}
+
 	cellRendered(){
 		this.dispatch("cell-rendered", this);
 	}