HyJavaImages Performance Test Results

the java api for highcharts


When starting/connecting with the start() or connect() methods the library will create a pool of Chrome pages ready for re-use. The default pool size value of 2 will suit most applications. Large volume applications can set this to a higher value to handle a higher concurrency. See the setPoolSize() method.

When generating images the library will acquire a page from the pool, generate the image, release the page back to the pool. If there are no available pages in the pool the library will wait until one becomes free.

In most cases a page is locked for a few hundred milliseconds before being released back to the pool.


The performance figures below are based on generating a base64 encoded png image of the listed Highcharts demo chart. Size and complexity of the chart will also have some impact on times.

For this test the JavaScript charting library files were not stored locally.

Concurrent users is the number of users calling the toBase64Image() method at exactly the same time.


Highcharts Demo Chart Concurrent Users Page Pool Size Base64 Encoded Image Generation (ms)
Basic column 1 2 64
Line chart 120
Pie chart 67
Basic column 2 2 80
Line chart 127
Pie chart 90
Basic column 3 2 131
Line chart 163
Pie chart 103
Basic column 4 2 172
Line chart 183
Pie chart 168
Basic column 5 2 221
Line chart 213
Pie chart 195
Basic column 5 3 158
Line chart 184
Pie chart 140
Basic column 5 4 145
Line chart 181
Pie chart 125

The Java API’s fully support all chart types and chart options in Highcharts v5.x, v6.x, v7.x, v8.x, v9.x;  Highcharts Stock v8.x, v9.x and ApexCharts v3.x.

Current versions supported are:




Start the HyJavaCharts demo Java web application

Start the HyJavaStock demo Java web application

Start the HyJavaApex demo Java web application

Start the HyJavaImages demo Java web application