Flex Chart making Browser unresponsive - performance

I have an flex-3 swf(simple line chart- that use http-service to get data for the chart)
and in my application ,in one page i have to list multiple rows of data( normally more than 30 rows), for each row i have to include this chart .
problem is when the numbers of rows are increasing at the loading time the browser went in to unresponsive state.
I want to know how to handle this situation , is there any better way to show the single flex-3 chart multiple times in a page.

Charts are heavy components. I don't recommend using too much instances. Also, you seem to just create more and more instances of time, that is not the best solution. You should reuse instances. Check out how Flex uses item renderer.

Related

Vaadin 23 Excel like grid

I'm in the need of an Excel like grid in an attempt to convert an "application" written in Google Calc to a real application. I've got one implementation using Vaadin, but it (also) suffers from a long page construction. The screenshot below uses a CSS flex grid with individual divs, and given 6 weeks, there are over 5000 individual divs.
Constructing this page takes over 20 seconds, not something users will be happy about. I'm working on a version based on a table, but it does not seem to improve much. In the end the same amount of cells need to be constructed, whether they are DIVs or TDs does not seem to matter much.
Is there a way to construct such a grid in a more speedy way? I'm more than happy to solve "where did the user click?" on the server side. To be aware of: besides the number of cells themselves, each also has specific content, so just getting a grid shown is not enough.
Each component (div, or something else) is managed by the server. So when you have 5000 of them it's quite slow. You need to reduce the number of components managed by the server.
I can't give you a better answer since I don't know the requirements. But the idea is to try to combine some elements.
You have an example of a table generated ( instead of each element one by one) here: https://cookbook.vaadin.com/grid-details-table.
You can also create or own component. There is also a paid add-on: spreadsheet which seems to fit your needs. It's still in preview: https://vaadin.com/roadmap
The problem here is the complexity of the UI itself. Rendering 5000+ cells will be slow what ever method you use and what ever framework you use. There will be big amount of elements in the DOM and you need to load also lot of data upfront. And as you see the result is huge, and it wont fit most screens. So I would recommend further design of the UI. Is it really necessary to show all the weeks at once? Your UI's complexity will already reduce a lot if you show only one week at the time and add buttons to browse the weeks forwards and backwards. But even with that optimization you will have lot of columns. I would consider adding another browsing direction by day. Further knowledge of the actual purpose of the UI will naturally give more insight how to develop it further.

Show 35k items in time line diagram with SAP VizFrame / d3.js (Performance)

I want to present my large time series dataset with approximately 35000 items in my time series line chart. I use the SAP UI5 VizChart which builds on d3.js.
The performance for this large dataset is very bad. Every time I want to zoom and navigate the application hangs for a few seconds.
The VizFrame loads the complete dataset, although I don't net it every time, because my section is much smaller. But if I want to have an overall overview, is there any way to display the diagram correctly without integrating all 35k data points? Mathematical? d3.js method?
I get the data via an odata service. Would it be sufficient if I hang a limit parameter or similar to the odata url? Thanks!
Edit: I have to use the VizFrame which based on d3.js but I don't know how I could use d3 methods directly. The documentations of VizFrame are very bad...
VizFrame API
Chart Property References

Error in loading data using Dimple.js

I am trying to draw simple scatter plot using dimple.js. It works if my dataset is small . But if i take large dataset of index 15000 then it will not works, How can i fix this problem?
The browser can handle 2k or so records when creating dimple charts, any more and the browser will crash (too complex). Aggregate your data offline or use something like http://dimplecharts.com which has an online pivot table tool that could potentially group and sum values. That tool creates a file. Then select a scatter plot layout in dimplecharts and then the shuffle button to load your pivot result into the chart, it does this automatically via the shuffle button.

Highlight Data Points in Birt Reports

creating simple charts with BIRT is easy, but now I would like to bring some more life to them...
imagine a simple line chart. Let's define as a requirement, that the maximum value should be highlighted. A further requirement would be that if the user clicks on this data point, something happens.
How can I solve this?
I can imagine that I could created a second value series which consists only of the highlighted data points.
But it would be nicer if there was a JavaScript API (or even a server side java api) with which I could loop through the data points and add a highlight on the fly. Is this possible?
I think I've found a good starting point:
http://www.birt-exchange.org/org/devshare/designing-birt-reports/276-birt-chart-scripting-dynamic-markers-and-datapoint-colors/
Now I have to find a way to add on click events to certain data points...

Increase page loading speed

In my app, I've a panorama-page which contains around 10 panorama items. Each panorama item has some path drawings, a list picker and few input fields.The problem i'm facing is that whenver i navigate to this page the navigation is very slow due to lot of content to initialize. If i comment the InitializeComponent(); the loading becomes fast.I thought of adding the XAML content in code, but the problem is that i've to access the input fields by their name in code, so it didn't worked.Any idea how i can speed up the navigation to the page.Thanks..
From the UI Guide:
Use either a single color background
or an image that spans the entire
panorama. If you decide to use an
image, any UI image type that is
supported by Silverlight is
acceptable, but JPEGs are recommended,
as they generally have smaller file
sizes than other formats.
You can use multiple images as a
background, but you should note that
only one image should be displayed at
any given time.
Background images should be between
480 x 800 pixels and 1024 x 800 pixels
(width x height) to ensure good
performance, minimal load time, and no scaling.
Consider hiding panorama sections
until they have content to display.
Also, 10 PanoramaItems seems like a lot since the recommended maximum is 4. You should either cut down on the number, or hide the content until it's required. Have a read of the best practice guide for Panoramas on MSDN.
I think you could improve page performance by creating usercontrols for the specific panorama items, add an empty panorama control to your page (with only the headers) and as picypg suggests load these usercontrols when they are needed.
Another way could be that you load the first page and show this one already to the user. In the background you could start loading the other panorama items.
My suggested approach would be for the first one. Using the lazyloading principle.
I woudl assume that your delays are due to the number of items on the page. This will lead to a very large object graph which will take a long time to create. I'd also expect it's using lots of memory and you have a very high fill rate which is slowing down the GPU.
Having input items/fields on PanoItems can cause UX issues if you're not careful.
That many panoItems could also cause potential navigation issues for the user.

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