I recently received an email from a supplier known to me, with an attached PDF.
Thunderbird show me in the message this:
To protect your privacy, Thunderbird has blocked remote content in this message. and a button Preferences
option A- I do nothing with this message. I miss him completely. And I open the attached pdf, it takes me 28 seconds to open 40k. one page.

? But it is open ok.
option B- If instead of opening it from the thunderbird, I say from the thunderbird * save as *, I keep it on my hard drive and open it with lucide, it takes 1 or 2 seconds to open.
With option A, if I tell the Lucide, save as, in all cases the Save as failure, but does not show any error.
With the option B- If I tell the Lucide Save as, save it correctly.
After seeing this problem look at popuplog.os2 and showed me this:
11-05-2016 11:02:22 SYS3170 PID 006a TID 0001 Slot 009e
D:\PROGRAMS\THUNDERBIRD-38.6.0.EN-US.OS2\THUNDERBIRD.EXE
c0010003
1e92f331
P1=00000003 P2=XXXXXXXX P3=XXXXXXXX P4=XXXXXXXX
EAX=032f0004 EBX=00000000 ECX=0013fbd8 EDX=13c80000
ESI=0000150b EDI=00000000
DS=0053 DSACC=d0f3 DSLIM=bfffffff
ES=0053 ESACC=d0f3 ESLIM=bfffffff
FS=150b FSACC=00f3 FSLIM=00000030
GS=0000 GSACC=**** GSLIM=********
CS:EIP=005b:13c1c5bf CSACC=d0df CSLIM=bfffffff
SS:ESP=0053:0013fc2c SSACC=d0f3 SSLIM=bfffffff
EBP=0013fc44 FLG=00010283
PMMERGE.DLL 0004:000ff331
I preferred to send this issue to this list, because I still have not clear whether the problem is in the Lucide in Thunderbird, or even a pre Thunderbird problem.
If other users are aware of these differences, then you could open the ticket where appropriate.
Info about pdf file:
Nombre del documento: Factura de venta AA16003617.pdf
TÃtulo: Factura de venta AA16003617
Formato: PDF-1.2
Autor: delete by me
Tema:
Palabras clave:
Creado con: wPDF by wpCubed GmbH
Producido con: Senior Factu por DSG Software, S.L.
Fonts in document:
Arial,Bold | TrueType | No | Arial fed
Arial | TrueType | No | Helvetica
The document is private, anyway I think the error comes before using the Lucide, not Lucide own.
Saludos