seo – Error with all page speed test tools

I am trying to reduce the loading time of my page

However all the tools I try to use give an error. The information in Google pagespeed gives a backend error, the pindom tool simply says it does not work, and webpagetest.org just finished 1/3 of the full test.
My site is https://jettmedia.nl/

Does anyone know why I receive these errors and how to solve them?

Seo – error page speed test tools

I am trying to reduce the loading time of my page speed, however, all the tools I try and use give an error. The information in Google pagespeed gives a backend error, the pindom tool simply says it does not work, and webpagetest.org just finished 1/3 of the full test.
My site is https://jettmedia.nl/
Does anyone know why I receive these errors and how to solve them?

Thanks in advance,
Thom

Ordinary differential equations: calculation of the variable speed in time and the final speed through second order EDO

I have to work with an example of physics to strengthen my understanding of the second law of Newton's movement through second-order ODE.

I have been given the following configurations: that the parachutist is descending under a parachute at a constant rate, where t is time; and I have to assume displacement and zero velocity at time zero.

$$ frac {d ^ 2y} {dt ^ 2} + frac {k} m ^ {} frac {dy} {dt} = g $$

I have come to the following general solution and (t):

$$ y (t) = A + Be ^ {- frac {kx} {m}} + g frac {m} {k} t $$

If I set the displacement and velocity at time zero, I got:

$$ A = -B = -g frac {m ^ 2} {k ^ 2} $$

From that point, how can I calculate:

  1. Vertical speed variable in time?
  2. Final velocity corresponding to the velocity of the parachutist when descending at a constant speed?

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Bitcoin Core: add more rates to speed up confirmations

I have sent a transaction, but it is taking a long time for any confirmation to appear. Up to now it has been 2 hours and 0 confirmations.

Is it possible that I now add more fees to that transaction to help speed up the confirmations?

If it is not possible to add more rates to speed up confirmations, is it possible to cancel the transaction and recover the bitcoins?

Safari – Slow download speed through web browser on macOS Mojave

I am trying to download a large file from the Internet (~ 4 GB), but for some reason, the download is extremely slow. An Internet speed test says that I have a download speed of 4Mbps, but the browser download never exceeds 500Kbps and, sometimes, it reaches 25Kbps.

I have read here about people who are moving away from Apple applications, but the change to Google Chrome has not altered the download speed. Any suggestions will be appreciated.

How to speed up boot time in lubuntu

New in linux and ubuntu.
I have shared the information on my laptop. The boot time is very slow slowwwww.
Even the launch of Firefox takes a long time.

Can someone help me figure out how to optimize my system?

Using Lubuntu (Ubuntu Version)

I send

$ lsb_release -a
There are no LSB modules available.
Dealer ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Code name: bionic

I send

$ sudo lshw -short
Description of the route device class H / W
==================================================================================================== ====
Aspire system A515-51G (0000000000000000)
/ 0 bus Charmander_KL
/ 0/0 memory 128KiB BIOS
/ 0/4 processor Intel (R) Core (TM) i5-8250U CPU @ 1.60
/ 0/4/5 memory 256KiB L1 cache
/ 0/4/6 memory 1MiB L2 cache
/ 0/4/7 memory 6MiB L3 cache
/ 0 / d 4GiB memory System memory
/ 0 / d / 0 4GiB memory SODIMM DDR4 synchronous Unbuffer
/ 0 / d / 1 memory         [empty]
/ 0/100 bridge Xeon E3-1200 v6 / 7th Gen Core Process
/ 0/100/2 UHD Graphics 620 screen
/ 0/100/14 Sunrise Point-LP USB 3.0 Control xHCI bus
/ 0/100/14/0 usb1 bus xHCI Host Controller
/ 0/100/14/0/5 Bluetooth wireless interface communication
/ 0/100/14/0/7 multimedia HD WebCam
/ 0/100/14/1 usb2 bus xHCI Host Controller
/ 0/100/15 generic Sunrise Point-LP Series IO I2C Contro
/0/100/15.1 Sunrise Point-LP serial IOC I2C controller
/ 0/100/16 Communication Sunrise Point-LP CSME HECI # 1
/ 0/100/17 Storage Sunrise Point-LP SATA Controller [AHC
/0/100/1c                   bridge         Sunrise Point-LP PCI Express Root Por
/0/100/1c/0                 display        GP108M [GeForce MX150]
/0/100/1c.4 Bridge Sunrise Point-LP PCI Express Root By
/0/100/1c.4/0 generic RTL8411B PCI Express card reader
/0/100/1c.4/0.1 enp2s0f1 network RTL8111 / 8168/8411 Gigabit PCI Express
/0/100/1c.5 Bridge Sunrise Point-LP PCI Express Root By
/0/100/1c.5/0 wlp3s0 wireless dual band network-CA 3168NGW[Stone
/ 0/100 / 1f bridge Chip family of the Intel (R) 100 LP series
/0/100/1f.2 memory memory controller
/0/100/1f.3 multimedia Sunrise Point-LP HD Audio
/0/100/1f.4 bus Sunrise Point-LP SMBus
/ 0/1 scsi0 storage
/0/1/0.0.0 / dev / sda disk 1TB WDC WD10SPZX-21Z
/0/1/0.0.0/1 / dev / sda1 volume 927GiB EXT4 volume
/0/1/0.0.0/2 / dev / sda2 volume 3970MiB extended partition
/0/1/0.0.0/2/5/ dev / sda5 volume 3970MiB Linux exchange volume

I used this command

$ systemd-analyze the critical chain
The time after the unit is active or started is printed after the "@" character.
The time it takes the unit to start is printed after the "+" character.

graphical.target @ 1min 6,870s
└─multi-user.target @ 1min 6,870s
└─kerneloops.service @ 1min 6.842s + 26ms
Worknetwork-online.target @ 1min 6,836s
└─NetworkManager-wait-online.service @ 58.305s + 8.529s
└─NetworkManager.service @ 48.794s + 9.507s
└─dbus.service @ 48.775s
└─basic.target @ 48.690s
└─sockets.target @ 48.690s
└─snapd.socket @ 48.620s + 69ms
└─sysinit.target @ 48.618s
└─system-timesyncd.service @ 48.458s + 159ms
└─system-tmpfiles-setup.service @ 47.215s + 1.185s
└─system-daily-flush.service @ 5.764s + 41.448s
└─system-remount-fs.service @ 4.325s + 1.438s
└─systemd-journald.socket @ 4.229s
└─system.slice @ 4.229s
└─-.slice @ 4.170s

I saw this publication
Can we talk about boot time in Ubuntu 18.04?

He ran

$ systemd-analyze time
The start ended at 4.907s (kernel) + 7min 8.181s (user space) = 7min 13.089s
graphical.target reached after 1 minute 6,870s in user space

He ran

$ service --estatus-everything | grep & # 39; + & # 39; | wc -l
27

3d – Adding spread to speed Vector3D

I am trying to give an object a velocity dispersion (for example, shotgun bullets or particle effect).

// dir is the initial address
float angle1 = atan (dir.x, dir.z) + propagation;
flotation angle2 = atan (dir.y, abs (dir.z)) + propagation;
vec3 xz_dir = vec3 (sin (angle1, 0.0, cos (angle2));
vec3 yz_dir = vec3 (0.0, sin (angle2), cos (angle2));
vec3 new_dir = vec3 (xz_dir.x * yz_dir.z, yz_dir.y, xz_dir.z * yz_dir.z);
new_dir.normalize ();

The new_dir extension works well on the XY and YZ planes, but if there is a Y component in the direction, the distribution along the XY plane does not work.

c ++: Minimize code duplication without using macros or sacrifice speed

Here is a snippet of code:

An online function:

inline void rayStep (const glm :: vec3 & ray, float & rayLength, const glm :: vec3 & distanceFactor, glm :: ivec3 & currentVoxelCoordinates, const glm :: ivec3 & raySign, const glm :: ivec3 & rayPositive, glm :: vec3 & positionInVoxelel) {
rayLength + = distanceFactor[smallestIndex];
currentVoxelCoordinates[smallestIndex] + = raySign[smallestIndex];
positionInVoxel + = ray * glm :: vec3 (distanceFactor[smallestIndex]);
positionInVoxel[smallestIndex] = 1 - rayPositive[smallestIndex];
}

It's use

glm :: ivec3 distanceFactor = (glm :: vec3 (rayPositive) - positionInVoxel) / ray;

if (distanceFactor.x <distanceFactor.y)
{
if (distanceFactor.x <distanceFactor.z)
{
rayStep (ray, rayLength, distanceFactor, currentVoxelCoordinates, raySign, rayPositive, positionInVoxel, 0);
}
plus
{
rayStep (ray, rayLength, distanceFactor, currentVoxelCoordinates, raySign, rayPositive, positionInVoxel, 2);
}
}
plus
{
if (distanceFactor.y <distanceFactor.z)
{
rayStep (ray, rayLength, distanceFactor, currentVoxelCoordinates, raySign, rayPositive, positionInVoxel, 1);
}
plus
{
rayStep (ray, rayLength, distanceFactor, currentVoxelCoordinates, raySign, rayPositive, positionInVoxel, 2);
}
}

I really dislike the way you see the use of the function.
One way to solve it is to calculate the index of the smallest component
and then simply use the body of the function directly in the code:

int smallestIndex = (distanceFactor.x <distanceFactor.y)? (distanceFactor.x <distanceFactor.z? 0: 2): (distanceFactor.y <distanceFactor.z? 1: 2);
rayLength + = distanceFactor[smallestIndex];
currentVoxelCoordinates[smallestIndex] + = raySign[smallestIndex];
positionInVoxel + = ray * glm :: vec3 (distanceFactor[smallestIndex]);
positionInVoxel[smallestIndex] = 1 - rayPositive[smallestIndex];

This seems much cleaner to me.

So, why have not I done it, if it bothers me so much?

The benefit of the previous code is that the value of the smallestComponentIndex The function is known at the time of compilation: the value is given as a constant and the function is online. This allows the compiler to perform some optimizations that it could not do if the value was unknown during the compile time, which is what happens in the example with the double ternary operator.

The impact of performance in my example is not small, the code goes from 30 ms to approximately 45 ms of the execution time, which means an increase of 50%.

This seems insignificant, but it is part of a simple ray tracer: if I want to scale it to perform more complex calculations, I need this part to be as fast as possible, since it is done once by ray intersection. This was executed in low resolution with only one ray per pixel, without taking into account the light sources. A simple ray issued, really, hence the execution time of 30ish ms.

Is there any way I can have both the code expression and the speed? A better way to express what I want to do, making sure that the value of the smallestComponentIndex Is it known at compile time?