bug:Performance defects when the adjust value of grid is true

Suite and Optimus Suite 8
#1

step 1: online samples for DHTMLX Grid
step 2: Grid.Sorting
Step 3: Replace JavaScript content with the following steps
step 4: Change the adjust value of the grid to true or false to wait for the display time difference

There is a huge difference in performance. When adjust is true, the data.add function is almost unusable

const grid = new dhx.Grid("grid", {
    columns: [
        { minWidth: 150, id: "country", header: [{ text: "Country" }] },
        { id: "population", header: [{ text: "Population" }] },
        { id: "yearlyChange", header: [{ text: "Yearly Change" }] },
        { id: "netChange", header: [{ text: "Net Change" }] },
        { id: "density", header: [{ text: "Density (P/Km²)" }] },
        { id: "area", header: [{ text: "Land Area (Km²)" }] },
        { id: "migrants", header: [{ text: "Migrants (net)" }] },
        { id: "fert", header: [{ text: "Fert. Rate" }] },
        { id: "age", header: [{ text: "Med. Age" }] },
        { id: "urban", header: [{ text: "Urban Pop" }] }
    ],
   // data: dataset,
    adjust: false
});

dataset.forEach(item=>{delete item.id});
let datas = new Array();
for (let i = 0; i < 50; i++) {
	JSON.parse(JSON.stringify(dataset)).forEach(item=>{datas.push(item)});
}
let startTime = new Date(); 
grid.data.parse(datas)
let  timeDiff = new Date().getTime() - startTime.getTime();
grid.data.removeAll();
let startTime1 = new Date();
grid.data.add(datas)
let  timeDiff1 = new Date().getTime() - startTime1.getTime();
const message = dhx.message({
    text:"rows:"+grid.data.getLength()+",adjust:"+grid.config.adjust+",time:"+timeDiff+"|"+",time1:"+timeDiff1, 
    icon:"dxi-clock", 
    css:"expire", 
    expire:10000
});