Performance when you have a lot of spelling errors - RapidSpell WPF - Forum

Hi,

We have an issue when you have a lot of spelling errors, typing text becomes very slow and the cursor has a delay.
I can reproduce this with a single textbox:




To reproduce:
1. Paste the following text:



Lorem Ipsum is simmply dummmy texxt opf thpe priinting and typpesetting indupstry. Lorpem Ipsum has bepen thpe inpdustry's standpard dummpy tepxt evper sinpce tphe 1p500s, whpen an unknpown prinpter tpok a gpalley opf typpe and scrampbled it to mpake a typpe spepcimen boopk. It phaps spurvived not ponly fipve cpenturies, bput aplso the leapp intpo electrponic typesetpting, repmaining essentially punchanged. Ipt wpas popularised ipn thpe 19p60s wpith thpe replease of Letraset shepets contaipning Lorem Ipsum passapges, anpd mpore recpntly wipth depsktop publisphing sofptware like Aldus PageMaker inclupding verpsions of Lorem Ipsum.

Lorem Ipsum is simmply dummmy texxt opf thpe priinting and typpesetting indupstry. Lorpem Ipsum has bepen thpe inpdustry's standpard dummpy tepxt evper sinpce tphe 1p500s, whpen an unknpown prinpter tpok a gpalley opf typpe and scrampbled it to mpake a typpe spepcimen boopk. It phaps spurvived not ponly fipve cpenturies, bput aplso the leapp intpo electrponic typesetpting, repmaining essentially punchanged. Ipt wpas popularised ipn thpe 19p60s wpith thpe replease of Letraset shepets contaipning Lorem Ipsum passapges, anpd mpore recpntly wipth depsktop publisphing sofptware like Aldus PageMaker inclupding verpsions of Lorem Ipsum.




2. Type some extra text in the textbox, you see this is very slow and the cursor has a delay.


Is there a solution for this issue?
Thanks.

No, there's no difference without debugging.

Sorry, there's nothing that we can see as an opportunity to optimize. Essentially it comes down to the fact that for every key press our Adorners must repaint themselves and to do that they need to call TextBox.GetRectFromCharacterIndex which is fairly slow. We've experimented with caching this data which helps under certain conditions, but still makes no difference if the user types and causes the text to reflow.

All I can suggest is disabling as you type checking if the number of errors gets too high.