Recent questions tagged Performance

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performance - Most memory efficient way to resize bitmaps on android?

I'm building an image-intensive social app where images are sent from the server to the device. When the ... to resize bitmaps on Android? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Optimizing File Cacheing and HTTP2

Our site is considering making the switch to http2. My understanding is that http2 renders optimization techniques like ... both http and http2. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Mapping 2 vectors - help to vectorize

Working in Matlab I have 2 vectors of x coordinate with different length. For example: xm = [15 20 24 25 ... ideas how to vectorize this code? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Is optimizing JavaScript for loops really necessary?

I read that it is advised to optimize loops in JavaScript by not reading the length attribute of an array ... Which version would you recommend? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Java: how much time does an empty loop use?

I am trying to test the speed of autoboxing and unboxing in Java, but when I try to compare it against an ... two loops still took some time? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Efficiently replace elements in array based on dictionary - NumPy / Python

First, of all, my apologies if this has been answered elsewhere. All I could find were questions about ... Thanks for the superquick help! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - How slow (how many cycles) is calculating a square root?

How slow (how many cycles) is calculating a square root? This came up in a molecular dynamics course where ... running time of the algorithms. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - SUMIFS function in Google Spreadsheet

I'm trying to have a similar function to SUMIFS (like SUMIF but with more than a single criterion) in a Google ... in a simpler and faster way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Subquery v/s inner join in sql server

I have following queries First one using inner join SELECT item_ID,item_Code,item_Name FROM [Pharmacy].[tblitemHdr] ... me better performance? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Is there a 128 bit integer in C++?

I need to store a 128 bits long UUID in a variable. Is there a 128-bit datatype in C++? I do not need ... from C++11 would be fine, too. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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859 views

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performance - Why is division more expensive than multiplication?

I am not really trying to optimize anything, but I remember hearing this from programmers all the time, that I ... before which is: "because". See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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performance - MongoDB 'count()' is very slow. How do we refine/work around with it?

I am currently using MongoDB with millions of data records. I discovered one thing that's pretty annoying. When I ... you do to improve that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Speed up to_sql() when writing Pandas DataFrame to Oracle database using SqlAlchemy and cx_Oracle

Using pandas dataframe's to_sql method, I can write a small number of rows to a table in oracle ... float64 group int64 action_reason object See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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488 views

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performance - application content goes behind the navigation bar in android L

As you can see my "Got It" button is behind the navigation bar.Not able to fix it!!! I have ... throughout the application. Please Help. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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642 views

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performance - How to speed up Java VM (JVM) startup time?

I am running tests that start multiple JVM processes. Summary startup time of JVMs is quite significant compared ... and reusing them somehow? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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603 views

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performance - Java toString() using reflection?

I was writing a toString() for a class in Java the other day by manually writing out each element of ... to improve my everyday programming. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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557 views

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performance - Slow first page load on asp.net site

Every now and then (always after a long period of idle-time, e.g. overnight) when I access a site built ... ask that particular admin. cheers :D See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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579 views

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performance - Java thread creation overhead

Conventional wisdom tells us that high-volume enterprise java applications should use thread pooling in preference to ... not use them. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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554 views

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performance - Content-Length header versus chunked encoding

I'm trying to weigh the pros and cons of setting the Content-Length HTTP header versus using chunked encoding to ... may not have thought of? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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583 views

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performance - Fastest way to swap elements in Python list

Is there any any faster way to swap two list elements in Python than L[a], L[b] = L[b], L[a] or ... resort to Cython or Weave or the like? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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5.1k views

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performance - Discussion about block html cache in Magento 1 CE

For my own shame I always was misunderstanding of how cache works. This cache is being checked during rendering of each block as ... points or if I'm not - why is this happened?...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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